The valency of nitrogen in dinitrogen oxide$\left({\mathrm{N}}_2\mathrm{O}\right)$ is 

Write the symbol of a monovalent cation.

What is the valency of nitrogen in the following compound:

${\mathrm{N}}_2{\mathrm{O}}_5$

What is the valency of nitrogen in the following compound:

${\mathrm{NO}}_2$

What is the valency of:

Fluorine in ${\mathrm{CaF}}_2$.

Write the symbol of divalent cation.

What is the valency of nitrogen in the following compound:

$\mathrm{NO}$

What is the valency of:

sulphur in ${\mathrm{SF}}_6$.

A metal $\mathrm{M}$ forms a carbonate having the formula ${\mathrm{M}}_2{\left({\mathrm{CO}}_3\right)}_3$.

What will be the formula of fluoride of $\mathrm{M}$?

What is the valency of:

phosphorus in ${\mathrm{PH}}_3$