MCQ
When an atom undergoes $\beta-$decay, its atomic number:
- ADoes not change
- ✓Increases by $1$
- CDecreases by $1$
- DIncreases by $2$
✓
Answer
Correct option: B.
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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