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Assertion: The whole mass of the atom is...

Assertion: The whole mass of the atom is concentrated in the nucleus.
Reason: The mass of a nucleus can be either less than or more than the sum of the masses of nucleons present in it.

A

If both assertion and reason are true and reason is the correct explanation of assertion .

B

If both assertion and reason are true but reason is not the correct explanation of assertion .

C

If assertion is true but reason is false .

D

If both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
c
The mass of a nucleus is always less than the sum of the masses of the nucleons present in it. When nucleons combine to form a nucleus , some energy is liberated , and this is the binding energy of the nucleus . The mass of the nucleus cannot be more than the total mass of the nucleons because then stable nucleus cannot be formed .
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Knowledge Check

  • The mass number of a nucleus is

    A
    always less then its number is
    B
    always more then its number is
    C
    sometimes equal to its atomic number
    D
    sometimes more then and sometimes equal to its atomic number

  • The mass number of a nucleus is.

    A
    Always less then its atomic number
    B
    Always more than its atomic number
    C
    Always equal to its atomic number
    D
    Sometimes more than and sometimes equal to its atomic number

  • The mass of a nucleus can be either less than or more than the sum of the masses of nucleons present in it. The whole mass of the atom is considered in the nucleus.

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

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    Why is the mass of a nucleus always less than the sum of the masses of its constituents-neutrons and protons?

    The mass number of a nucleus is equal to

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