Question

the question is in the photo and if you dont know the answer then please dont answer ​

Answer 1

Refer the photograph and the explanation

Explanation:

An alpha particle decreases the mass no by 4 and atomic 1 by 1. A beta particle increases the atomic no by 1 and does not affect the mass no. A gamma particle does not affect either of them.

When element X will emit a beta particle the atomic no increases by 1 and the mass no remains the same so it has emitted a beta particle..

In element Y the atomic no is decreased by 2 (Z+1-2=Z-1) and the mass no is decreased by 4 hence it has emitted an alpha particle.

In element K the atomic and mass no remains same so it has emitted gamma particle.