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Mass number is the sum of the number of ...

Mass number is the sum of the number of protrons in an atom.

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Mass number is the sum of the number of protons and neutrons in an atom.

The mass number of the atom of an element is the sum of the number of protons and neutrons in the atom. (True / False)

Knowledge Check

  • Assertion:Atomic number is a more fundamental property of an element than its atomic mass. Reason:Atomic number is equal to number of protons in an atom.

    A
    If both assertion and reason is the correct explanation of assertion.
    B
    If both assertion and reason is the correct explanation of assertion.
    C
    If both assertion and reason is the correct explanation of assertion.
    D
    If both assertion and reason is the correct explanation of assertion.

  • If an atom has atomic number 10 and mass number 23, then what will be the number of protons and neutrons in an atom respectively

    A
    10, 10
    B
    10, 23
    C
    13, 10
    D
    10, 13

  • The atomic number of Potassium is 19 and its mass number is 39. The number of neutrons its atom is

    A
    19
    B
    39
    C
    20
    D
    58

    • Similar Questions

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    Derive a relatioship between the atomic number, mass number and number of neutrons in an atom.

    Q 4 Two atoms are said to be isobars if. * (a) they have same atomic number but different mass number. (b) they have same number of electrons but different number of neutrons (c) they have same number of neutrons but different number of electrons. (d) sum of the number of protons and neutrons is same but the number of protons is different.

    The atomic mass of lead is 208 and its atomic number is 82. The atomic mass of bismuth is 209 and its atomic number is 83. The ratio of neutrons/protons in the atom

    An element has atomic number 13 and an atomic mass of 27. The number of electrons in each atom of this element is ____________ and the number of neutrons is _________

    The mass number A, atomic number Z and number of neutrons n are related as

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