Question

Decrease in atomic number is observed during :
A) $\alpha$ -emission
B) $\beta$ -emission
C) positron emission
D) electron capture

• A. B is correct
• B. A and B are correct
• C. A, C and D are correct
• D. Only C is correct

Answer 1

The correct option is C A, C and D are correct

In $\beta$ emission, atomic no is increased.
${}_{92}^{239}U{\to }_{93}^{239}U$

While for $\alpha$ emission
${}_{92}^{238}U{\to }_{90}^{234}Th$

Similarly, positron and electron capture decreases the atomic number.