<Li> In beta decay, the mass number remains unchanged while the atomic number becomes greater by 1 than that of the parent radioisotope, e.g.: </Li> <Dl> <Dd> <Dl> <Dd> 82 212 Pb → 83 212 Bi (\ displaystyle () _ (82) ^ (212) (\ text (Pb)) \ to () _ (83) ^ (212) (\ text (Bi))) </Dd> </Dl> </Dd> </Dl> <Dd> <Dl> <Dd> 82 212 Pb → 83 212 Bi (\ displaystyle () _ (82) ^ (212) (\ text (Pb)) \ to () _ (83) ^ (212) (\ text (Bi))) </Dd> </Dl> </Dd> <Dl> <Dd> 82 212 Pb → 83 212 Bi (\ displaystyle () _ (82) ^ (212) (\ text (Pb)) \ to () _ (83) ^ (212) (\ text (Bi))) </Dd> </Dl>

State rutherford and soddy law of radioactive decay