Question

An element A decays into an element C by a two step process $A \rightarrow B +_{2}He^{4}$ and $B \rightarrow C + 2e^{-}$ then

• A. A and C are isotopes
• B. A and C are isobars
• C. B andC are isotopes
• D. A nad B are isobars

Answer 1

Answer: (A)

A and C are isotopes

Answer 2

: ${}_{Z}^{A}A \rightarrow_{Z - 2}^{A - 4}B +_{2}^{4}He$

${}_{Z - 2}^{A - 4}B \rightarrow_{Z}^{A - 4}C + 2_{- 1}^{0}e$

Hence , A and C are isotopes.