Question

What is the primary and secondary valence of ${\mathrm{PtCl}}_2.2{\mathrm{NH}}_3$?

Answer 1

Primary valency

• The number of ions required to fulfill the charge on the metal ion is known as primary valency.

Secondary valency

• The number of ions or molecules attached to the metal ion is known as secondary valency.

For example

• In ${\mathrm{PtCl}}_2.2{\mathrm{NH}}_3$, there is no primary valency and four secondary valency.