What is formed when a non-metal gains electrons?
Anion
Non-metals have 5 to 7 electrons in their outermost shell and tend to gain electrons to complete their octet.
Gaining electrons gives the atom more electrons than protons, so it becomes a negatively charged ion, called an anion (e.g. Cl−).
A cation is a positive ion formed when a metal loses electrons.
Hence, the answer is Anion.
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