Which ion has a positive charge?

valence electron

covalent ion

cation

anion

Cations

Explanation: In chemistry, the word ion tells us if an atom has a charge so in chemistry, an ion is an atom or a group of atoms that have an electrical charge.

Often, you will see atoms that have the same number of protons and neutrons in the nucleus of an atom. So the charges balance out and you don't have any total charge. However, sometimes an atom can gain or lose electrons so it will either get more or fewer electrons than protons and then the numbers don't balance out anymore.

So a cation is a certain type of ion which is a positively charged ion.