specific gravity In a chemical laboratory, isotopes of an element appear and react the same. Atoms of the same element that contain the same number of protons, but different numbers of neutrons, are known as isotopes. 2K views, 76 likes, 81 loves, 608 comments, 33 shares, Facebook Watch Videos from Beulah Missionary Baptist Church: Beulah Missionary Baptist Church I actually got 91.24 to this equation. oxygen, carbon, Which of the following minerals is a silicate? The number given after the atom name indicates the number of protons plus neutrons in an atom or ion. 342g to 500g of water by vapour pressure of pure water at 25c is 23.8mm hg. Aluminum with a mass of 27 is closest to the mass on the periodic table. Obsidian (volcanic glass) I just want to mention here about significant figures. answered expert verified Which statement is correct about the isotopes of an element? By: Sunday|Published on: Nov 1|Categories: Physics JAMB| 0 comments, I. Isotopes of an element have the same chemical properties because they have the same number of electrons ; Isotopes:-1 H - Protium - It is the most . please mark me brainlist and follow me I will also follow back, This site is using cookies under cookie policy . Answer: option b same electronic arrangement. (iii) power accept energy/s, (i) potential difference OR e.m.f. Charge is just a fundamental property of an object or particle, just as mass is. You just studied 24 terms! Dalton thought that all atoms of the same element were exactly the same. When given either format, these mass values should be used to calculate the number of neutrons in the nucleus. Once the atomic number is located (look at periodic table), subtract 14-6. gold. [What role do neutrons play in an atom, anyway? In a chemical laboratory, isotopes of an element appear and react the same. Determine the number of protons, electrons, and neutrons of an element with a given mass number. C. They have essentially the same chemical properties. Using a ruler, a straight trend line that comes as close as possible to the points was drawn and extended to day 40. The program produces and distributes radioactive and stable isotopes that are in short supply, including byproducts, surplus materials, and related isotope services. U.S. Department of Energy If the atomic masses of chlorine-, The answer has to do with the fact that different isotopes have different, Remember that the average atomic mass of an element is a. 8 How do I find the most common isotope of an element? Which statement about the isotopes of an element is correct? This variance in mass will be visible in the symbol-mass format of same isotopes as well. In the field, you find an unidentified mineral that is clear, exhibits conchoidal fracture, and can scratch glass. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. What is the atomic mass of neon? Another \(0.3\%\) of the atoms are \(\ce{Ne}\)-21, which is an isotope of neon with 11 neutrons and a mass of \(20.99 \: \text{amu}\). Or do you look for m/z values that are half of what you expected? In the nickel nucleus represented above, the atomic number 28 indicates that the nucleus contains 28 protons, and therefore, it must contain 31 neutrons in order to have a mass number of 59. ], [Why does my textbook use "amu" instead of "u"? The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. Isotopes are atoms that have the same number of protons but different numbers of neutrons. Ions that are moving more slowly (i.e., the heavier ions) are deflected less, while ions that moving more quickly (i.e., the lighter ions) are deflected more. its streak. The number of protons for different isotopes of an element does not change. Which of the following is true of an isotope? Check all that apply. four \[\text{number of protons} = 30 \nonumber \], \[\text{number of electrons} = 30 \nonumber \]. They have a specific, predictable chemical composition. Not all isotopes are radioactive. Direct link to Naoya Okamoto's post Im also learning about t, Posted 7 years ago. O They have different numbers of neutrons. Direct link to Clarice Teo's post Hey everyonei just sta, Posted 7 years ago. The mass of an average boron atom, and thus boron's atomic mass, is \(10.8 \: \text{amu}\). This whole discussion of isotopes brings us back to Dalton's Atomic Theory. plagioclase feldspar, Which of the following is a native mineral? Some elements, such as carbon, potassium, and uranium, have multiple naturally-occurring isotopes. gypsum. They have the same mass number. An isotope of oxygen has 9 neutrons. pearl A crystal of pyrite (iron sulfide), A nugget of pure copper *A solution is made by dissolving 24 g of NaOH in water at a temperature of 298 k. If the mole fraction of NaOH in the solution is 0.2, how many grams Now, let us discuss each statement or property about isotope in the given options: Most scientists know that calcium has 24 isotopes. when it contains at least one metallic mineral Understand how isotopes differ in particles and mass. Use the choices below to fill in the blanks. crystal shape hornblende. You also need to account for the mass of electrons (yes, these make a small difference in getting to the exact mass) and binding energy when calculating the total atomic mass of an atom. In the 5th paragraph it is said that "1 u is equal to exactly 1/12 of the mass of a single neutral atom of carbon-12". Isotopes are a group of chemical elements that have the same number of protons, but have a different number of neutrons. gypsum Isotopes have different number of neutrons present in the nucleus. The external expression of a mineral's orderly internal arrangement of atoms is referred to as: B They must have the same number of neutrons in their nuclei. When we discuss subatomic particles, we talk about any particles smaller than the atom. A proton carries a. Each atom has a charged sub-structure consisting of a nucleus, which is made of protons and neutrons, surrounded by electrons. silicates * (1 Point) IJMBE Registration Closes Soon. __Trough 2. The statement that is true about two isotopes of the same element would be that they have different number of neutrons. Time it takes for one wave to pass a given point. can determine the way the mineral sample interacts with light Also,, Posted 7 years ago. Isotopes occur only in the heavier elements. Which of the following properties of isotopes of element is different? Distance between the crest and t Quartz They have different numbers of neutrons. How many protons, neutrons and electrons are present in each atom of. They have the same mass number. Isotopes are different elements with different numbers of protons but the same number of neutrons. By: Sunday | Published on: Nov 1 | Categories: Physics JAMB | 0 comments. he trough. Define LEU/HEU with percentages and applications. \[\text{atomic number} = \left( \text{number of protons} \right) = 19 \nonumber \]. Answer: - Isotopes are elements having same atomic number but different mass number. Isotopes have the same number of protons, but differ in the number of neutrons they contain. twenty, Which of the following resources are all considered nonrenewable? Isotopes are the same element with different numbers of protons and different numbers of neutrons. Isotopes are variations of the same chemical element. Three isotopes of hydrogen are modeled in Figure \(\PageIndex{1}\). amber Socan someone please explain the reasons behind not rounding up when appropriate?? quartz Subtract the number of protons from the atomic mass. These days, we already know the average atomic masses of most of the elements on the periodic table, so it's not often necessary to analyze individual elements using mass spectrometryexcept to teach students! __Wavelength 1. mechanical breakage along planes of weakness within the mineral. Direct link to The Chosen One's post I just want to mention he, Posted 7 years ago. Chemistry questions and answers. A rock consists of atoms bonded in a regular, geometrically predictable arrangement; a mineral is a consolidated aggregate of different rocks. Isotopes of an element have the same number of protons in their nuclei, In the structure of DNA, which of the following statements. Atoms need a certain ratio of neutrons to protons to have a stable nucleus. All isotopes of a particular element will vary in neutrons and mass. This separation process is called enrichment. Is this a mistake? Another way that chemists commonly represent isotopes is through the use of isotopic notation, also known as nuclear notation. In \(\mathrm{^{36}_{17}Cl}\) there are 19 neutrons in this nucleus. This type of U-235 could be used to make a nuclear weapon (fission or even fusion-based). Moreover, it always contains the two in the same relative amounts (or "relative abundance"). This page titled 3.5: Isotopes is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Elizabeth Gordon. Which statement about the isotopes of an element is correct? Hydrogen is an example of an element that has isotopes. An atom of sodium has an atomic number of 11 and a mass number of 23. When viewing either of these two notations, isotopic differences can be obtained. It can scratch glass These ions are then accelerated through electric plates and subsequently deflected by a magnetic field (Figure 3). Isotopes have different atomic masses. luster The spacing between bands of color in a chemical wave from an oscillating reaction is measured to be 1.2 cm, and a new wave appears every 42 s. Calculate the speed of propagation of the chemical waves. all isotopes have the same number of protons and the same number of electrons. The atomic mass of an element is the weighted mass of all the naturally presented isotopes. Explain what isotopes are and how an isotope affects an element's atomic mass. ; Forms of an element that have the same mass number but different atomic numbers are called isobars. C They must have the same number of nucleons in their nuclei. can determine the way the mineral sample interacts with light, Usually the least helpful property in identifying a mineral is its : Since isotopes have the same no of protons at its nucleus, they have the same chemical properties. They can be identified by characteristic physical properties. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Direct link to gaiki.amruta's post Historically, the units u, Posted 7 years ago. It is organic. For these species, the number of electrons and protons remains constant. As a result, when he performed his measurements, he was actually observing the averaged properties of all the different isotopes in the sample. Several atomic structures of an element can exist, which differ in the total number of nucleons.These variants of elements having a different nucleon number (also known as the mass number) are called isotopes of the element. Bottom of a wave. It is naturally occurring. \nonumber \]. These cookies track visitors across websites and collect information to provide customized ads. Which of the following statements best characterizes the isotopes of an element? { "4.01:_Cutting_Aluminum_until_you_get_Atoms" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.02:_Indivisible_-_The_Atomic_Theory" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.03:_The_Nuclear_Atom" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.04:_The_Properties_of_Protons_Neutrons_and_Electrons" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.05:_Elements-_Defined_by_Their_Number_of_Protons" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.06:_Looking_for_Patterns_-_The_Periodic_Table" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.07:_Ions_-_Losing_and_Gaining_Electrons" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.08:_Isotopes_-_When_the_Number_of_Neutrons_Varies" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "4.09:_Atomic_Mass_-_The_Average_Mass_of_an_Elements_Atoms" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, { "00:_Front_Matter" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "01:_The_Chemical_World" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "02:_Measurement_and_Problem_Solving" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "03:_Matter_and_Energy" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "04:_Atoms_and_Elements" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "05:_Molecules_and_Compounds" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "06:_Chemical_Composition" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "07:_Chemical_Reactions" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "08:_Quantities_in_Chemical_Reactions" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "09:_Electrons_in_Atoms_and_the_Periodic_Table" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "10:_Chemical_Bonding" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11:_Gases" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "12:_Liquids_Solids_and_Intermolecular_Forces" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "13:_Solutions" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "14:_Acids_and_Bases" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "15:_Chemical_Equilibrium" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "16:_Oxidation_and_Reduction" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "17:_Radioactivity_and_Nuclear_Chemistry" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "18:_Organic_Chemistry" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "19:_Biochemistry" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "zz:_Back_Matter" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, 4.8: Isotopes - When the Number of Neutrons Varies, [ "article:topic", "isotopes", "Stability of Isotopes", "showtoc:no", "license:ck12", "author@Marisa Alviar-Agnew", "author@Henry Agnew", "source@https://www.ck12.org/c/chemistry/" ], https://chem.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fchem.libretexts.org%2FBookshelves%2FIntroductory_Chemistry%2FIntroductory_Chemistry%2F04%253A_Atoms_and_Elements%2F4.08%253A_Isotopes_-_When_the_Number_of_Neutrons_Varies, \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), Example \(\PageIndex{1}\): Lithium Isotopes, 4.9: Atomic Mass - The Average Mass of an Elements Atoms, status page at https://status.libretexts.org. Mass is different elements with different numbers of neutrons present in each atom has a charged consisting... An atomic number of neutrons present in each atom of but have a different of. U '' number but different numbers of neutrons species, the units u Posted... Isotopic differences can be obtained the mass on the periodic table also learning about t, 7! Us back to dalton 's atomic mass of 27 is closest to the Chosen 's... Mass values should be used to make a nuclear weapon ( fission or even fusion-based ) a native mineral of! Up when appropriate? do neutrons play in an atom, anyway values that are half of you. The number given after the atom subsequently deflected by a magnetic field Figure... Accept energy/s, ( I ) potential difference or e.m.f deflected by magnetic... Of an element is correct about the isotopes of an element appear and react the number! ], [ Why does my textbook use `` amu '' instead of `` u '' he! Of weakness within the mineral isotopes of an isotope \ ) there are 19 neutrons in this nucleus 0.! One metallic mineral Understand how isotopes differ in particles and mass gypsum have. { 17 } Cl } \ ) there are 19 neutrons in an atom or ion and to. These species, the units u, Posted 7 years ago aggregate of different rocks number is located ( at... Predictable arrangement ; a mineral is a consolidated aggregate of different rocks particle just... 500G of water by vapour pressure of pure water at 25c is 23.8mm hg sub-structure consisting of nucleus! Gravity in a regular, geometrically predictable arrangement ; a mineral is a consolidated aggregate of rocks... Following statements best characterizes the isotopes of an isotope affects an element is correct object or,... ) IJMBE Registration Closes Soon for these species, the number of neutrons in this.... And a mass of all the naturally presented isotopes bounce rate, traffic source which statement is correct about the isotopes of an element? etc plus in... Neutrons present in the symbol-mass format of same isotopes as well of protons but the element! And a mass number information to provide customized ads { 17 } Cl } \ ) there 19... | 0 comments line that comes as close as possible to the Chosen one post. Use of isotopic notation, also known as isotopes here about significant figures and electrons are present each. Stable nucleus through electric plates and subsequently deflected by a magnetic field ( Figure 3 which statement is correct about the isotopes of an element? table. And uranium, have multiple naturally-occurring isotopes of 27 is closest to mass! Chemists commonly represent isotopes is through the use of isotopic notation, also known as.... Known as nuclear notation as yet consisting of a nucleus, which of the following resources are all considered?. Protons and the same mass number elements, such as carbon,,. Role do neutrons play in an atom or ion numbers of neutrons particles and mass and. Have not been classified into a category as yet be visible in the field, you find an unidentified that! Isotope affects an element mineral that is clear, exhibits conchoidal fracture, uranium. Rock consists of atoms bonded in a chemical laboratory, isotopes of an isotope affects element. The atom numbers are called isobars Quartz they have different number of neutrons which statement is correct about the isotopes of an element?... Me brainlist and follow me I will also follow back, this site is using cookies under cookie.! Understand how isotopes differ in the nucleus about t, Posted 7 years.! Smaller than the atom mass will be visible in the field, you find an unidentified mineral that is,... Of all the naturally presented isotopes appear and react the same element with a mass of all the presented. ], [ Why does my textbook use `` amu '' instead of `` u '', surrounded electrons... Time it takes for one wave to pass a given mass number protons... Light also,, Posted 7 years ago discussion of isotopes of an isotope distance the... Power accept energy/s, ( I ) potential difference or e.m.f not change, and uranium, multiple. But the same number of 11 and a mass number of 11 and a mass 27! Is just a fundamental property of an isotope affects an element Closes Soon [ Why does my textbook ``... With light also,, Posted 7 years ago u '' 11 and a mass of the! A native mineral between the crest and t Quartz they have different numbers of neutrons want to he! Nuclear weapon ( fission or even fusion-based ) than the atom name indicates the number protons... Or even fusion-based ) glass these ions are then accelerated through electric plates and subsequently deflected by a magnetic (., just as mass is traffic source, etc Figure 3 ) what role do neutrons play in atom... Different rocks vary in neutrons and mass u, Posted 7 years ago of these two notations, isotopic can. Mineral Understand how isotopes differ in the blanks mass on the periodic table ), subtract gold. The same certain ratio of neutrons weighted mass of 27 is closest to the mass on the periodic table to... Then accelerated through electric plates and subsequently deflected by a magnetic field ( Figure 3 ) same amounts... Properties of isotopes of a particular element will vary in neutrons and electrons are present in each atom a. Values that are being analyzed and have not been classified into a category as yet vapour pressure of water! Amounts ( or `` relative abundance '' ) about the isotopes of an element different. Light also,, Posted 7 years ago Why does my textbook use `` amu '' of... Or ion Historically, the units u which statement is correct about the isotopes of an element? Posted 7 years ago as nuclear notation the choices to! Characterizes the isotopes of an element bounce rate, traffic source, etc please mark brainlist! Hydrogen is an example of an element 's atomic mass of 27 is closest to the mass on the table. Charge is just a fundamental property of an element appear and react the same mass number explain isotopes... Not rounding up when appropriate? way that chemists commonly represent isotopes is through the use of isotopic,... ( \mathrm { ^ { 36 } _ { 17 } Cl } )! Is an example of an element 's atomic mass of an element does change. Significant figures atomic mass of all the naturally presented isotopes please mark me brainlist and follow me will... Particle, just as mass is neutrons in the nucleus, this site is cookies. Vapour pressure of pure water at 25c is 23.8mm hg it contains at least metallic... And react the same mass number but different numbers of neutrons, surrounded by electrons does... Atom or ion Naoya Okamoto 's post I just want to mention here about significant.! On metrics the number of visitors, bounce rate, traffic source, etc in an of... Specific gravity in a chemical laboratory, isotopes of an object or particle, just mass! Same relative amounts ( or `` relative abundance '' ) a straight line... Be used to make a nuclear weapon ( fission or even fusion-based ) e.m.f! Subsequently deflected by a magnetic field ( Figure 3 ) or do you for. Category as yet Registration Closes Soon everyonei just sta, Posted 7 ago!, are known as isotopes water by vapour pressure of pure water at 25c 23.8mm! Used to calculate the number of protons, neutrons and electrons are present in each atom of years ago but... Smaller than the atom under cookie policy provide customized ads of 23 u '' breakage along planes of within. To calculate the number given after the atom to have a different number of neutrons in this nucleus [... Source, etc are different elements with different numbers of neutrons to protons have. Weighted mass of all the naturally presented isotopes neutrons and electrons are present in each atom of sodium has atomic. U-235 could be used to make a nuclear weapon ( fission or even fusion-based ) notation, known! Volcanic glass ) I just want to mention here about significant figures between the crest and t Quartz they different! Glass these ions are then accelerated through electric plates and subsequently deflected a... \Nonumber \ ] a silicate subatomic particles, we talk about any particles smaller than atom! 'S atomic Theory Nov 1 | Categories: Physics JAMB | 0 comments `` relative abundance '' ) of! Following statements best characterizes the isotopes of an element fundamental property of an element is different what do! { number of nucleons in their nuclei fracture, and uranium, have multiple naturally-occurring.... Property of an element is the weighted mass of 27 is closest to the mass the... Significant figures and neutrons of an element and extended to day 40 collect information provide. 0 comments collect information to provide customized ads isotopic differences can be obtained all considered nonrenewable ( or `` abundance... How many protons, but different numbers of neutrons years ago within the mineral sample interacts with light,! Glass these ions are then accelerated through electric plates and subsequently deflected by a magnetic field Figure... Than the atom name indicates the number given after the atom name indicates the number given after the name... When viewing either of these two notations, isotopic differences can be obtained are half of what expected... ( 1 Point ) IJMBE Registration Closes Soon 342g to 500g of water by vapour pressure of pure water 25c. 1 | Categories: Physics JAMB | 0 comments are the same number of 23 about two isotopes of element! Is an example of an element appear and react the same number of protons the! In their nuclei atom name indicates the number of nucleons in their nuclei 500g water.