Question

What quantities are conserved when balancing a nuclear reaction?

Answer 1

When balancing a nuclear reaction:
(1) Mass is conserved
(2) Charge is conserved

Explanation:

Consider the following example of nuclear fusion:

In the above example:
(1) Mass is conserved, as 2 + 3 = 5 and 4 + 1 = 5
(2) Charge is conserved, as 1 + 1 = 2 and 2 + 0 = 2