Which particle has a positive charge?

The particle with a positive charge is a proton. Protons are subatomic particles found in the nucleus of an atom, and they play a crucial role in defining the identity of an element. The presence of protons determines the atomic number of an element, which in turn determines its position in the periodic table. Each proton carries a unit of positive charge, which helps maintain the overall balance of charge within an atom when combined with neutrons (which have no charge) and electrons (which have a negative charge).

An alpha particle, while also having a positive charge due to containing two protons and two neutrons, is not typically classified on its own as a singular particle in the same way protons are. Neutrons are neutral particles, and electrons are negatively charged, which means they do not have a positive charge. Thus, protons stand out as the primary source of positive charge in atomic structure.