State whether the statement is true or false.

A negatively charged ion is known as an anion.

An ion is a small electrically charged particle. Ions are simply charged atoms (simple ions) or small charged "molecules" (polyatomic ions).

Simple ions include ${\mathrm{Na}}^{+}, {\mathrm{Ca}}^{2+} \mathrm{and} {\mathrm{Cl}}^{–}.$
Polyatomic ions include${\left({\mathrm{NH}}_4\right)}^{+}, {\left({\mathrm{CO}}_3\right)}^{2-}$ and ${\mathrm{OH}}^{–}.$
Unlike protons and neutrons, electrons can be easily removed and added to an atom. As a result of this addition or removal of electrons from an atom, ions are formed. 

Negative ions, known as anions, are formed when an atom gains electrons and now has more electrons than protons, indicating that the number of protons and electrons is out of balance.

If an atom loses electrons, it becomes a positive ion known as a cation, which has fewer electrons than protons and therefore has a positive charge. Atoms do this so that they can have a full outer shell of electrons and be more energetically stable.

Hence, the correct option is (A).