Question

In the disintegration series In the disintegration series ${}_{92}^{238}U\stackrel{\alpha }{\to }X\stackrel{{\beta }^{-}}{\to }{}_Z^{A}Y$ The values of Z and A respectively will be

• A. 92, 236
• B. 88, 230
• C. 90, 234
• D. 91, 234

Answer 1

The correct option is D

91, 234

$\alpha$ decreases mass number by 4 and reduces charge number by 2. ${\beta }^{-}$ decay keeps mass number unchanged and increases charge by 1. Clearly, (d) is the right choice.