What quantity might change in a nuclear reaction that does not change in a chemical reaction?
The number of protons and/or neutrons in the atomic nucleus can change in a nuclear reaction, which does not occur in a chemical reaction.
In a nuclear reaction, the quantity that might change is the number of protons and neutrons in the nucleus of an atom, also known as the atomic number and the mass number. This change can result in the transformation of one element into a different element.
In contrast, in a chemical reaction, the atoms of the elements involved remain the same, and only the arrangement of their electrons changes. The total number of protons, neutrons, and electrons remains constant in a chemical reaction.