1(iv)
A radioactive nucleus containing 128 nucleons emits a β – particle. After β – emission the number of nucleons present in the nucleus will be :
- (a)128
- (b)129
- (c)124
- (d)127
Show SolutionHide Solution↓
128
Reason — In β – particle emission, number of nucleons (i.e., sum of number of protons and number of neutrons) remains the same.