Question

an element emits succession 2 alpha particles and one beta particle what is change in mass number

Answer 1

Answer:

decrease of 7 mass number

Explanation:

cause:

Imagine a atom which has mass number valued A .so we know when 1 alpha particle emits, the mass number decreases amount 4 unit. So if 2 alpha particles emit, mass decrease 8 unit.

and one beta particle's emission means increase of 1 mass unit. so

{(4+4)-1}=7