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Q.

The sum of the total number of protons and neutrons present in the nucleus of an atom is called ____________

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a

mass number

b

atomic number

c

isobar

d

isotope

answer is A.

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Detailed Solution

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The sum of the total number of protons and neutrons present in the nucleus of an atom is called mass number.

Mass number of atom =  Mass of Protons + Mass of neutron

The mass of electrons is neglected because its mass is negligible as compared to protons and neutrons.

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