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Q.

Mass number of an atom (A) is equal to

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a

total number of protons, electrons and neutrons

b

total number of neutrons

c

total number of protons and electrons

d

total number of nucleons

answer is A.

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Detailed Solution

Mass number of an atom (A) is total number of nucleons, i.e. A = number of protons + number of neutrons.

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Mass number of an atom (A) is equal to