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Atoms having the same …… but different ...

Atoms having the same …… but different ….. are called isotopes .

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Atomic number ,mass number
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Knowledge Check

  • Isotopes have the same

    A
    Atomic number
    B
    Mass number
    C
    Avogadro's number
    D
    none of these

  • Note: Read the assertion and reason carefully and then mark the correct option out of the options given below: Assertion (A) : Moseley showed that atomic number is a more fundamental property than atomic mass. Reason (R) : Atoms of the same element having the same atomic number but different atomic masses are called isotopes.

    A
    Both (A) and (R) are true and (R ) is correct explanation of the assertion.
    B
    Both (A) and (R ) are true but (R ) is explanation of the assertion.
    C
    (A) is true but (R ) is false.
    D
    (A) is false but (R ) is true.

  • Assertion: ._(1)H^(1), ._(1)H^(2) and ._(1)H^(3) are isotopes of hydrogen. Reason : Nuclides of the same element of different mass numbers are called isotopes of that element

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion
    B
    If both assertion and reason are true but reason is not the correct explanantion of the assertion
    C
    If assertion is true but reason is false
    D
    If assertion is false but reason is true