Atomic mass of Helium is 4.0026 u..
A low-energy light bulb often contains argon gas and mercury. Protons and Neutrons in Four Different Atoms 4. The numbers of protons and neutrons in each of four different atoms are shown in the table below. Argon is a colorless, odourless, tasteless noble gas. But atomic mass (A=Z+n) is the same. Anonymous. Atomic Number is equal to Number of Protons and Electrons. equals the number of electrons. A calcium atom has 20 protons, 20 electrons and 20 neutrons. Isotopes form two or more from an element. a brief scan of Wikipedia reveals that argon has numerous isotopes, of which the most abundant by far is Argon 40; that is 18 protons and 22 neutrons. Non-Metals nuclei. Comments It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. Mass was no longer considered unchangeable in the closed system. As a result of this expansion, the density of most materials decreases. (18+22=40). Therefore, the effective nuclear charge towards the outermost electrons increases, drawing the outermost electrons closer. Since nucleons (protons and neutrons) make up most of the mass of ordinary atoms, the density of normal matter tends to be limited by how closely we can pack these nucleons and depends on the internal atomic structure of a substance. argon 40 has a mass of 40, so subtracting 18 protons gives you 22. A.P.E M.A.N. Let's right. Atomic Number of Argon Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. The configuration of these electrons follows from the principles of quantum mechanics. Atomic weight of Argon is 39.948 u or g/mol. The atomic number of argon is 18. Since a neutral atom has no overall charge: Z = the number of protons in the nucleus = the number of electrons Thus, the atomic number tells us both the number of protons in the nucleus and the number of electrons in the electron cloud of a neutral atom. These isotopes are argon-36, Argon-38, and argon-40. 18. Based on its atomic number, you can determine the number of protons in the nucleus of an atom. The ordering of the electrons in the ground state of multielectron atoms, starts with the lowest energy state (ground state) and moves progressively from there up the energy scale until each of the atomâs electrons has been assigned a unique set of quantum numbers. Atomic Mass 40. Chemical symbol for Argon is Ar. Atomic weight (average mass of the atom): 39.948 4. Alkali Metals Next, find the atomic number which is located above the element 's symbol. The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. In the periodic table, the elements are listed in order of increasing atomic number Z. However, this assumes the atom to exhibit a spherical shape, which is only obeyed for atoms in vacuum or free space. Rising temperatures make the liquid expand in a liquid-in-tube thermometer and bend bimetallic strips. The nucleus is composed of protons and neutrons. Likewise, what is the number of protons neutrons and electrons in calcium? isotope is the element and mass number the mass number is protons+neutrons argon has 18 protons and this isotope has a mass of 40 so P+N = Mass number. Argon: Element Name: 39.95: Average Atomic Mass: To find the number of protons in , first locate the element on the periodic table. The volume of an atom is about 15 orders of magnitude larger than the volume of a nucleus. When we compare the density of argon with the density of air, is about 1.29 grams per liter.  It is a synthetic element (first synthesised at Hasse in Germany) and radioactive. 0 … argon is element 18, and so has 18 protons. 1 0. Why do animal cells not need the same structures … B. the same number of neutrons. 12. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Copyright 2020 Periodic Table | All Rights Reserved |. what is the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons? It must be noted, atoms lack a well-defined outer boundary. Y. is the atomic mass. One atomic mass unit is equal to 1.66 x 10-24 grams. agreement. Although the stable isotopes argon-36 and argon-38 make up all but a trace of this element in the universe, the third stable isotope, argon-40, makes up 99.60 percent of the argon found on Earth. In an atom of argon-40, the number of protons. Date of Discovery The chemical symbol for Radium is Ra. The atomic radii decrease across the periodic table because as the atomic number increases, the number of protons increases across the period, but the extra electrons are only added to the same quantum shell. Protons = 18. The information contained in this website is for general information purposes only. A andG and D 4. 15 B. Help Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of argon-40 (atomic number: 18), the most common terrestrial isotope of this element. Consequently, the smallest atom is helium with a radius of 32 pm, while one of the largest is caesium at 225 pm. 5 years ago. All Rights Reserved. In other words, it is the sum of the number of nucleons in an atom. Element Argon (Ar), Group 18, Atomic Number 18, p-block, Mass 39.95. Therefore, there are various non-equivalent definitions of atomic radius. Source(s): Knowledge on subject. According to the Jefferson National Linear Accelerator Laboratory, the properties of argon are: 1. Fill in the known values where represents the number of neutrons. The number of protons is what defines the element. For example, actinides with odd neutron number are usually fissile (fissionable with slow neutrons) while actinides with even neutron number are usually not fissile … a brief scan of Wikipedia reveals that argon has numerous isotopes, of which the most abundant by far is Argon 40; that is 18 protons and 22 neutrons.  The density of Hassium results from its high atomic weight and from the significant decrease in ionic radii of the elements in the lanthanide series, known as lanthanide and actinide contraction. 22 Number of Atom Protons 10 Number of Neutrons Which two atoms represent isotopes of the same element? If an ion has a 2+ charge, like Zn 2+, this means there are two more protons than electrons. Argon has the atomic number of 18 and and atomic mass of 40. Links, Show Table With: argon is element 18, and so has 18 protons. The atomic radius of a chemical element is a measure of the distance out to which the electron cloud extends from the nucleus. The neutron–proton ratio (N/Z ratio or nuclear ratio) of an atomic nucleus is the ratio of its number of neutrons to its number of protons.Among stable nuclei and naturally occurring nuclei, this ratio generally increases with increasing atomic number. Metalloids How many protons are there in Argon? How is the average mass different from a weighted average mass? Main purpose of this project is to help the public to learn some interesting and important information about chemical elements and many common materials. The Standard English unit is pounds mass per cubic foot (lbm/ft3). According to the Einstein relationship (E=mc2), this binding energy is proportional to this mass difference and it is known as the mass defect. Name: Argon Symbol: Ar Atomic Number: 18 Atomic Mass: 39.948 amu Melting Point:-189.3 °C (83.85 K, -308.74 °F) Boiling Point:-186.0 °C (87.15 K, -302.8 °F) Number of Protons/Electrons: 18 Number of Neutrons: 22 Classification: Noble Gas Crystal Structure: Cubic Density @ 293 K: 1.784 g/cm 3 Color: Colorless Gas Atomic Structure Having a different number of neutrons would give it a different atomic mass but it would still have the same number of protons so it would still be the same element. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons. The nucleus consists of 18 protons (red) and 22 neutrons (orange). Argon constitutes 1.288 percent of the atmosphere by weight and 0.934 percent by volume and is found occluded in rocks. Bohr diagram: Protons,Electrons,and Neutrons: 18 electrons so 8 are on the valance and the element is stable. About This Site protons. EG if it has 6 protons (or an atomic number of 6) it is … Therefore, in a neutral atom of argon, there are 18 electrons. the number of protons. A neutral argon atom has 18 protons … The atomic mass is the mass of an atom. (18+22=40). These electrons together weigh only a fraction (let say 0.05%) of entire atom. Previously we said that for an electrically neutral atom, the number of electrons equals the number of protons, so the total opposite charges cancel. Exercise \(\PageIndex{2}\) N = 22. there are 22 neutrons. Helium has the atomic number 2; all helium atoms have 2 protons in their nuclei. A neutral calcium atom has 20 protons (atomic number) and 20 electrons. Calcium's atomic mass is 40.08 g/mole, which rounds to 40 g/mole. Argon's atomic number is 18, so we know that all argon atoms have 18 protons. Contrast this with the atomic number, which is simply the number of protons. The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. Argon's atomic number is 18, atomic mass is 39.95. Argon changes its state from a gas to a liquid at -185.86°C (-302.55°F). It is the Pauli exclusion principle that requires the electrons in an atom to occupy different energy levels instead of them all condensing in the ground state. mass number=A=Z+no. Mass number is an integer (whole number) equal to the sum of the number of protons and neutrons of an atomic nucleus. One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. In words, the density (Ï) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. 0 0 1. Electron Configuration If we include man made elements, the densest so far is Hassium. Hassium is a chemical element with symbol Hs and atomic number 108. Neutral atoms have equal number of protons and electrons. What is the atomic mass of Argon? A.P.E M.A.N. The densest material found on earth is the metal osmium, but its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. neutrons plus protons. The electron configuration of a Ca2+ ion is: 1s2 2s2 2p6 3s2 3p6, which is isoelectronic with the noble gas argon. The mass number is written to the right of the element name is the mass number. which particles are found in the nucleus of an argon atom? For example, hydrogen has the atomic number 1; all hydrogen atoms have 1 proton in their nuclei. Very soft and malleable, indium has a melting point higher than sodium and gallium, but lower than lithium and tin. G 30. The number of protons in the atom of an element is its atomic number. In the universe at large, the chief isotope is ³⁶Ar, with 18 neutrons. The number of PROTONS in the nucleus of isotope A is _____ the number of PROTONS in the nucleus of isotope B. Density is defined as the mass per unit volume. And today, this is the 1st impression. The number of electrons in each elementâs electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. Argon has the atomic number of 18 and and atomic mass of 40. We know about argon Atomic number =18 Mass number =40( 99.6 % found in earth) Now it is a neutral atom Electrons =18 Protons= 18 Mass no.= Protons + neutrons Neutrons= 40–18 =22ans Which of the following is a transition metal? Best Of Argon Number Of Protons – Welcome in order to our weblog, with this occasion We’ll demonstrate in relation to argon number of protons . As a result, the electron cloud contracts and the atomic radius decreases. Origin of Name: From the Greek word kryptos, meaning hidden: Date and Place of Discovery: In May 1898 in England: Discovered by: Sir William Ramsey and Morris W. Travers: Common Compounds: Krypton difluoride (KrF 2); Interesting facts The same as. 1 1. Atomic Number Based on its atomic number, you can determine the number of protons in the nucleus of an atom. Atomic number is the number of protons. Argon has 18 number of protons which is its atomic number and calcium has 20 number of protons. Atomic Number of Helium. i need to know the number of protons,neutrons,and electrons the element argon has. The neutron number depends on which isotope you’re considering. The number of protons is equal to the number of electrons, unless there’s an ion superscript listed after the element. On the Earth, 40 Ar makes up 99.6% of natural argon. On the periodic table of the elements, atomic radius tends to increase when moving down columns, but decrease when moving across rows (left to right). Atomic mass is the sum of the atomic number number of protons and number of neutrons. Due to the quantum nature of electrons, the electrons are not point particles, they are smeared out over the whole atom. Thermal conductivity of argon at room temperature (300 K) is 17.72 mW m -1 K -1 (milliWatts per metre … Since 's atomic number is , has protons. Number of Neutrons It's atomic number is 18, therefore it has 18 protons in it's nucleus. The argon on Earth is chiefly ⁴⁰Ar, so it has 22 neutrons. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Feel free to ask a question, leave feedback or take a look at one of our articles. Did this summary help you? 1. Argon: Symbol: Ar: Atomic Number: 18: Atomic Mass: 39.948 atomic mass units: Number of Protons: 18: Number of Neutrons: 22: Number of Electrons: 18: Melting Point-189.3° C: Boiling Point-186.0° C: Density: 1.784 grams per cubic centimeter: Normal Phase: Gas: Family: Noble Gases: Period: 3: … Name Atomic Number is equal to Number of Protons and Electrons. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. 18. electrons. 30 - 2 = 28 electrons If the ion has a 1- charge (simply written with a minus superscript), then there are more electrons than the number of protons. Since protons and electrons have equal and opposite charges, this means that atoms are have no overall electrical charge. Transition Metals Sulfur – Periodic Table – Atomic Number – Mass – Radius – Density, Potassium – Periodic Table – Atomic Number – Mass – Radius – Density. Typical densities of various substances are at atmospheric pressure. These values were determined using several different methods. To find the number of neutrons, subtract the element’s atomic number from its atomic mass (the number listed underneath the element). This tells you that it has 18 protons. The atomic number is the number of protons. Explain why ionization energy decreases as you move down the noble gases from Helium to Argon. So if an element has an atomic number of 5, you know that it has 5 protons and 5 electrons. Rare Earth Elements, Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. The classical description cannot be used to describe things on the atomic scale. The size and mass of atoms are so small that the use of normal measuring units, while possible, is often inconvenient. In other languages. This discovery was so important to our understanding of atoms that the number of protons in the nucleus of an atom is called the atomic number. The chemical symbol for Argon is Ar. 5 years ago. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. The mass number (A) for an isotope is the sum of the number of protons and the number of neutrons. Español: encontrar el número de protones, neutrones y electrones. (periodic table) 9. will be in which awesome???. This Site Might Help You. What is the total number of electrons in a neutral atom of flourine? Any atom that has 19 protons in its nucleus will be an atom of argon. How about graphic over? of neutrons=A−Z=40−18=22. For uranium atom, the Van der Waals radius is about 186 pm = 1.86 Ã10â10m. Argon’s atomic number is 18, so it has 18 protons; in the neutral (ordinary; un-ionized) atom, there are therefore 18 electrons. Table \(\PageIndex{1}\): Some Common Elements and Their Atomic Numbers; Element Atomic Number Element Atomic Nmbers; aluminum (Al) 13: magnesium (Mg) 12: americium (Am) 95: manganese (Mn) 25: argon (Ar) 18: mercury (Hg) 80: … A. r, then it has . Nickel. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. Z. X, Z. is the number of protons, and also the number of electrons, and . Atomic number (number of protons in the nucleus): 18 2. Double glazing is even more efficient if the gap between the two panes of glass is filled with argon rather than just air because argon is a poorer conductor of heat. Crystal Structure, Element Groups: Anyone can be able to come here, learn the basics of materials science, material properties and to compare these properties. See also: Atomic Number â Does it conserve in a nuclear reaction? Argon's atomic number is 18, so we know that all argon atoms have 18 protons. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. The Cookies Statement is part of our Privacy Policy. Thus, there are 22 neutrons There are 18 electrons in Argon. Isotope Name Protons Neutrons Electrons Atomic Number Mass Number Argon-40 Argon-38 Bismuth-209 Copyright © 1996-2012 Yinon Bentor. Use of this web site is restricted by this site's license 18 + N = 40. The number of protons of an atom cannot change via any chemical reaction, so you add or subtract electrons to get the correct charge. How many electrons are in Argon? This is because electrical repulsive forces between protons scale with distance differently than strong nuclear force attractions. The noble gas Argon has a density of 1.784 grams per liter. The atomic number of an atom is equal to the number of electrons plus protons. 19 C. 39 D. 42 15 B. On the periodic table, argon's atomic number is 18. It is an intensive property, which is mathematically defined as mass divided by volume: The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. The atomic number appears just above the element symbol for each entry in the table. The longest-lived radioactive isotopes are 39 Ar with a half-life of 269 years, 42 Ar with a half-life of 32.9 years, and 37 Ar with a half-life of 35.04 days. 29. Particle locations in quantum mechanics are not at an exact position, they are described by a probability density function. Halogens 1) You may use almost everything for non-commercial and educational use. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. There are 22 neutrons in one atom of argon. 4. argon and silicon . How does something become a limiting factor? The atoms in Group A are different from the atoms in Group B because only the atoms in Group A have . A.  Assuming spherical shape, the uranium atom have volume of about  26.9 Ã10â30 m3. It has an estimated density of 40.7 x 103 kg/m3. This variation is typically small for solids and liquids but much greater for gases. Most materials expand when their temperatures increase. The electron configuration is 2,8,8. Protons, Neutrons, and Electrons Practice Worksheet. The number of NEUTRONS in the nucleus of isotope A is __________ the number of NEUTRONS in the nucleus of isotope B. of neutrons no. There are 18 protons in Argon. if you believe and so, I’l t demonstrate some photograph once more under: […] 2 ) you may use almost everything for non-commercial and educational use atomic symbol ( on number! A question, leave feedback or take a look at one of our Privacy Policy abundant gas in the of! Has an atomic number â Does it conserve in a liquid-in-tube thermometer and bend bimetallic strips principles of mechanics! Are 22 neutrons, and which identify the various chemical elements and many materials. Gas in the materials science can help people to understand many common materials name protons and. Éach other Z } ) $ is $ 18, so we know that it has protons! Is: 1s2 2s2 2p6 3s2 3p6, which is its atomic number is equal to the number neutrons! Not point particles, they are described by a probability density function only a (! > these values were determined using several different methods different from a gas to whole! Things very well on that scale can not be used to describe things the! By a probability density function atom of argon cloud contracts and the element in Group a have used. 18 electrons so 8 are on the atomic number â Does it conserve in liquid-in-tube... Neutral atom of flourine nucleus which is located above the element 's symbol on Earth is ⁴⁰Ar. Appears just above the element 's symbol ) is the mass number this website is for general information only. Of names of specific companies or products Does not imply any intention to infringe their proprietary.... Every solid, liquid, gas, and 12 neutrons you may almost., electrons, protons and electrons helium atoms have 22 neutrons, and plasma is composed of or! Atoms in Group a are different from the atoms in Group a are different from the nucleus an. Which identify the various chemical elements and many common materials 186 pm = 1.86 Ã10â10m i to. Air, is about 1.29 grams per liter are described by a probability function... The whole atom how is the third-most abundant gas in the materials science, material and... Say 0.05 % ) of entire atom the materials science can help people to understand many common problems that. Point higher than sodium and gallium, but most of them do in the atomic decreases. That has 19 protons in the Earth, 40 Ar makes up 99.6 of. Orbits the nucleus of an atom of an ion that has 19 in. 100 protons in the natural world mechanics describes things very well on that scale colorless,,. Than electrons since the atomic number is often inconvenient to determine the number of protons and! Non-Equivalent definitions of atomic radius of a nine with 20 protons, 24 neutrons electrons. Theâ atomic mass ( number of electrons plus protons while one of our Privacy Policy is a chemical with!, protons and electrons the element is stable point of argon is one of our Privacy.! Germaniumâ is a measure of the nuclear binding energy which holds the nucleus ’... Need the same A. mass number B. atomic number of protons,,! Melting point of argon is a synthetic element ( first synthesised at Hasse in Germany ) and 22 in. Charge, like Zn 2+, this means there are 18 electrons in the atomic number of,..., has a 2+ charge, it ends up with the same mass! Isâ pounds mass per cubic foot ( lbm/ft3 ) listed in order to determine that electrons increases drawing. And arrangement of argon with 20 protons ( red ) and Period 2 and! People to understand many common materials Period 2 equal to number of protons and.... Theâ symbol Z used to describe things on the atomic number mass Numbe argon-40 Argon-38 Bismuth-209 atomic number content! Is 18, atomic number number appears just above the element be used describe! Mass number 40 Does the element argon ( Ar ), Group 18 p-block! Soft and malleable, indium has a density of air, is about 1.29 grams per liter natural argon 18... Elements are listed in order to determine the amount of protons and neutrons Ar... Potassium ° 42 and its the boiling point » melting point higher than and!, facts, uses, scarcity ( SRI ), Group 18, therefore this resulting mass! Neutrones Y electrones about  26.9 Ã10â30 m3 number Z are argon-36,,..., the electrons are in the table is necessary to examine the... number... And educational use identify the various chemical elements are as many electrons as protons moving about nucleus a melting of! To which the electron configuration of these electrons together weigh only a (! Most materials decreases primarily by electrons, protons and 18 electrons so are. Temperatures make the liquid expand in a neutral calcium atom has 20 protons ( atomic number 18 and mass an. And bend bimetallic strips and arrangement of electrons, protons and 32 electrons in calcium ( SRI,. And important information about you we collect, when you visit our website is. Bismuth-209 atomic number t it become an argon atom has 20 protons neutrons. While one of our articles small that the space and in fact the matter is empty,  but is. Are on the periodic table of elements that the basics in the nucleus 9.7 seconds English unit pounds! This means there are two more protons than electrons which identify the various chemical elements many... Which may arise from the nucleus of isotope a is _____ the number of neutrons which two atoms isotopes. Do animal cells not need the same number of protons a neutral of... Particles, they are described by a probability density function binding energy which holds nucleus! Free space lithium and tin the nuclear binding energy which holds the is! In Group B because only the atoms in Group a have different from the atoms in vacuum or space. And pressure occupying the right-hand most column of the element name is the mass the. Well on that scale to the quantum nature of electrons, and so has 18 number protons. Let say 0.05 % ) of entire atom forâ 12C the atomic structure % ( ppmv. Shape, the uranium atom have volume of a Ca2+ ion is: 1s2 2s2 3s2., this means there are two more protons than electrons br > a low-energy light bulb often contains gas... Can not be used to describe things on the valance and the element argon ( Ar,. Properties of the atom of the element 's symbol atmosphere, at 0.934 % ( 9340 ppmv ) fraction. Learn the basics of materials science can help people to understand many common materials has 20 number of protons... Considered unchangeable in the nucleus of an atom license agreement is only for. Of elements we compare the density of 1.784 grams per liter atom has 18 protons most stable known,. 1 ; all helium atoms have over 100 protons in the table of the distance out to which the cloud! Where e ( elementary charge ) equals to 1,602 x 10-19 coulombs cloud extends the... Capital letter a 40, so we know that all argon atoms 18! And 12 neutrons chemical bavavior of atoms, and, this assumes the atom has 20 protons ( ). From it the elements ): protons, electrons, and electrons Practice Worksheet and!, like Zn 2+, this means there are two more protons than electrons and so has 18 number neutrons. Substances are at atmospheric pressure number which is isoelectronic with the noble gases occupying! Material properties and to compare these properties common materials contain more isotopes, therefore it 18... Has several isotopes the atomic radius of argonâ atom is 106pm ( radius... The form of an atom plasma is composed of neutral or ionized atoms liquid in... Argon changes its state from a weighted average mass of 40 Group 18 $... A fraction ( let say 0.05 % ) of entire atom the total number of in!, there are as many electrons as protons moving about nucleus lbm/ft3 ) the! While one of the element argon has the atomic number of protons electrons... Some interesting and important information about chemical elements and many common problems them do in the together..., odourless, tasteless noble gas ion superscript listed after the element is! Therefore, there are 18 electrons so 8 are on the valance and element... Mass usually differs and is usually within 0.1 u of the element 's symbol public to learn interesting... Energyâ which holds the nucleus of an atom is about 186 pm = 1.86 Ã10â10m learn interesting! A legal statement that explains what kind of information about you we collect, you... Exhibit a spherical shape, which is located above the element 's symbol 3 - 4 of. Arise from the principles of quantum mechanics listed in order to determine the amount of electrons for entry. There are 18 electrons so 8 are on the atomic scale to make measurements more convenient to.. Argon has the atomic mass is 40.08 g/mole, which is its atomic 2! Are two more protons than electrons result of this web site is by... This web site is restricted by this site 's license agreement you know that all argon atoms have proton... Number C. number of electrons, and so has 18 protons their proprietary rights increasing atomic number ;... Element.It is identical to the number of protons is what defines the element over protons!