Question

A nucleus 84X²⁰² of an element emits an Alpha particles followed by a beta particle. The final nucleus is aYb. Find a and b?​

Answer 1

Answer:

In alpha decay, decreases 4 unit mass number and 2 unit atomic number.

In beta decay, increases one unit atomic number but mass will remain same.

So,

n

m

X→

α

n−2

m−4

Y→

2β

n−2+2

m−4

Z or

n

m−4

Z