What is the charge of a proton?

The charge of a proton is positive, which is why option D is the correct answer. In atomic structure, protons are positively charged particles found in the nucleus of an atom, and they play a crucial role in determining the element's identity and its chemical properties. The positive charge of a proton is equal in magnitude but opposite in sign to that of an electron, which is negatively charged. This balance of charges in an atom contributes to its overall electrical neutrality when the number of protons equals the number of electrons. Understanding this basic concept is fundamental in physical science, as it lays the groundwork for exploring atomic structure, chemical bonding, and the behavior of matter.