Question

what even changes an atom into an ion? * choose sharing of electrons with another atom gain or loss of electrons with another atom gain or loss of one or more neutrons chemical reaction that forms a molecule

Explanation:

An ion is formed when an atom gains or loses electrons, changing its electrical charge. Sharing electrons forms covalent bonds in molecules, changing neutrons affects isotopes, and a chemical - reaction forming a molecule is a broader concept not specific to ion - formation.

Answer:

gain or loss of electrons with another atom