Question
When an atom undergoes $\beta$-decay, its atomic number:
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Answer
- Increases by 1
When an atom undergoes $\beta$-decay the atomic number increases by 1.
When an atom undergoes $\beta$-decay, one of the neutrons breaks into one proton and one electron. The resultant electron is then ejected out of the nucleus and this is called as the $\beta$ particle.
While the resultant proton stays inside the nucleus which results in increase of atomic number by 1, whereas the atomic mass remains invariant.
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