Question

what causes an atom to have a positive charge? it loses a proton. it gains a proton. it gains an electron. it loses an electron.

Explanation:

An atom is neutral when the number of protons (positive charge) and electrons (negative charge) is equal. When an atom loses an electron, the number of protons exceeds the number of electrons, resulting in a positive charge. Protons are in the nucleus and are not easily lost or gained in normal chemical processes. Gaining an electron would make the atom negatively charged.

Answer:

It loses an electron.