Question

What two quantities are always conserved in a nuclear reaction equation?

Answer 1

Answer:B

Explanation:

Option A:

In the nuclear reactions,neutron can be split into proton an electron.

In this case,the  number of protons are increasing,increasing the atomic number.

Hence,the atomic number is not conserved.

Option B:

In any reaction the sum of number of neutrons and number of protons remain constant before and after the reaction.

Option C:

The mass number may change for the atoms.For example $\alpha$ emission reduces the atomic number by $2.$

Option D:

In the nuclear reactions,neutron can be split into proton an electron.

So,they number of neutrons may change.