Question

which statement about the balanced equations for nuclear and chemical changes is correct? (1 point)

both are balanced according to the number of atoms of each element before and after the change.

a chemical equation is balanced according to mass number. a nuclear equation is balanced according to the number of atoms before and after the change.

both are balanced according to the total mass before and after the change.

a nuclear equation is balanced according to mass number. a chemical equation is balanced according to the number of atoms before and after the change.

Explanation:

In chemical equations, atoms of each element must be conserved (same number before and after the change). In nuclear equations, the mass - number (sum of protons and neutrons) must be conserved.

Answer:

A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the number of atoms before and after the change.