Question

Give one example of a monovalent monoatomic anion.

Answer 1

Anion:

• It is defined as a negatively charged ion which is formed when an atom gains an extra electron.
• Since the ion formed is having more electrons than protons, hence carries a net negative charge.
• An example of anion is ${\mathrm{Cl}}^{-}$which is formed when a chlorine atom gains one extra electron to complete its octet.

Monovalent anion:

• An atom that gains only one electron and acquires net $-1$ negative charge is called as monovalent anion.
• Example; chloride ion (${\mathrm{Cl}}^{-}$), hydroxide ion (${\mathrm{OH}}^{-}$) etc.

Monoatomic anion:

• An ion with net negative charge which consists of exactly one atom is called as monoatomic anion.
• Example; chloride ion (${\mathrm{Cl}}^{-}$), bromide ion (${\mathrm{Br}}^{-}$)etc.

Thus, an example of a monovalent monoatomic anion is chloride ion (${\mathbf{Cl}}^{\mathbf{-}}$).