During the emission of a beta particle, the quantity that remains the same is

Mass Number

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Atomic Number

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Number of Protons

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Number of Neutrons

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Solution

The correct option is A
Mass Number

During beta emission a neutron gets converted into a proton and hence total number of protons and neutrons remains constant i.e., mass number remains.

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_{83}^{214} B i

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Element	Mass number	Atomic number	No. of protons	No. of electrons	No. of neutrons

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