An element a decays into element C by a two step process

Q: An element a decays into element C by a two step process

A → B + ₂He⁴

B → C + 2 e^–

(a) A and C are isotopes

(b) A and C are isobars

(c) A and B are isotopes

(d) A and B are isobars

Sol: (a) _ZA^A → _Z-2B^A-4 + ₂He⁴

_Z-2B^A-4 → _ZC^A-4 + 2 _-1 e⁰