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23 April, 21:19

Which property of the isotopes must be different?

A. The atomic number

B. The electric charge

C. The element name

D. The mass number

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Answers (2)
  1. 23 April, 21:26
    0
    I think the answer is D
  2. 23 April, 21:38
    0
    D. The mass number

    Explanation:

    Isotopes are defined for same atoms

    If an atom has same number of protons and same number of electrons but different number of neutrons in it then such pair of atoms is known as isotopes

    so we have

    same atomic number in all isotopes

    since atomic number is same so we can say that total charge of the two atoms must be same

    So we will say that since number of neutrons is different in isotopes to sum of neutrons and protons which is known as mass number is different in such pair of atoms

    So correct answer is

    D. The mass number
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