Physics Atomic and Nuclear Physics Nuclear Energy, Binding Energy, Mass Defect, Nuclear Force MCQ (Single Correct)

The mass number of nucleus is

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

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The correct answer is:
A

Mass number of an element is the total number of protons and neutrons present inside the atomic nucleus of the element. It is represented by . is different for different elements. Mass number of a nucleus is sometimes equal to its atomic number, for example in case of hydrogen, number of neutrons . So, mass number atomic number.

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