Question

What change occurs to an atom when it forms negative ion​

Answer 1

Answer:

The outer shells of non-metal atoms gain electrons when they form ions. The ions formed are negative because they have more electrons than protons

Explanation:

Answer 2

Ions are formed when atoms gain or lose electrons. Gaining electrons changes an atom into a negative ion. Losing electrons changes an atom into a positive ion. Individual atoms often do not form ions by themselves.