Question

what event changes an atom into an ion?
a. the sharing of electrons with another atom
b. the gain or loss of one or more electrons
c. the gain or loss of one or more neutrons

Explanation:

An ion is formed when an atom gains or loses one or more electrons, altering its electrical charge. Sharing electrons forms covalent bonds, and changing neutrons affects isotopes, not ion - formation.

Answer:

B. the gain or loss of one or more electrons