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During the em...

Question

During the emission of a beta particle, the ______ number remains the same.

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Solution

On emiting a $β$ particle, the number of neutron is increased by one and the number of protones is increased by one such that the number of nucleons in the nucleus remains the same.
$_{0}^{1} n \to_{1}^{1} p +_{- 1}^{0} β$
Thus, during the emission of a beta particle the mass number remains same

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