A chlorine atom that has gained an electron and has an overall negative charge is an example of an anion. The correct option is a.
Anions are the negatively charged particles of the atom. There are two types of ions, anions, and cations. Cations are positively charged ions.
A chlorine atom has gained an electron, when atoms gain an electron, it attains negative charges. So, when a negative charge is attained, it converts into an anion. The element will be called an anion. When it donates electrons, it attains a positive charge.
Thus, the correct option is a, anion.
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The question is incomplete. Your most probably complete question is given below:
anion
cation
proton
ions.
