Question

A nucleus mnX emits one α particle and two β– particles. The resulting nucleus is :

Answer 1

when a nucleus emits 1 alpha particle

it decreases the atomic number (Z) by

2 and mass number(A)by 4

new A=A-4, new Z=Z-2

when 1 beta particle emits,it increases

Z by 1and no change in A (for 2 beta particle 2_4)beta particle

final A=A-4 final Z=Z