examine the nuclear reaction: $_{1}^{1}h + _{0}^{1}n\rightarrow_{1}^{2}h$. why is this classified as a…

Brief Explanations:

In nuclear reactions, changes occur in the nucleus. In the given reaction $_{1}^{1}H + {0}^{1}n\rightarrow{1}^{2}H$, a change happens in the nucleus as a neutron combines with a hydrogen - 1 nucleus to form a hydrogen - 2 nucleus. Chemical reactions involve only the rearrangement of electrons, not changes in the nucleus. The reaction is balanced, no new compound (as it's still hydrogen) or new element (same atomic number 1) is formed in the sense of changing the element identity.

Answer:

C. A change has occurred in a nucleus.