Chemistry
Give reasons for the following.
The mass number of an atom is slightly less than the actual atomic mass.
Atomic Structure
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Answer
The mass number is a whole number approximation of the atomic mass in atomic mass units since the mass of the proton as well as the mass of the neutrons is approximately equal to 1 a.m.u. and the mass of the electron is negligible. Hence, the mass number is slightly less than the actual atomic mass.
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