Which of the following describes a positively charged ion?

A positively charged ion is referred to as a cation. This term is used in chemistry to describe an atom or molecule that has lost one or more electrons, resulting in a net positive charge. The loss of negatively charged electrons means that there are now more protons than electrons in the particle, which leads to its positive charge.

In contrast, an anion is a negatively charged ion, formed when an atom or molecule gains one or more electrons. Isotopes refer to variants of a particular chemical element that have the same number of protons but different numbers of neutrons, which does not affect the charge. Molecules are chemical structures formed from two or more atoms bonded together, which can be either neutral or charged but do not specifically indicate a charged state like ions do.

Thus, a cation is specifically defined as a positively charged ion, making it the accurate description in this context.