Question

Elements which possess valency 1 are called ____________.

Answer 1

Valency: The combining capacity of an atom is known as its valency. The number of bonds that an atom can form as part of a compound is expressed by the valency of the element.

Monovalent: An atom, ion, or chemical group with a valence of one, which thus can form one covalent bond is called monovalent.

Atoms that are monovalent are: $\mathrm{Hydrogen}\left(\mathrm{H}\right),\mathrm{Lithium}\left(\mathrm{Li}\right),\mathrm{Sodium}\left(\mathrm{Na}\right),\mathrm{Chlorine}\left(\mathrm{Cl}\right)$

Thus, Elements which possess valency 1 are called monovalent.