Calculate the valency of:

$\mathrm{Mn}$ in ${\mathrm{MnO}}_2$

Valency:

• The combining capacity of an element is called valency.
• In ${\mathrm{MnO}}_2$, the two atoms of oxygen($\mathrm{O}$) combine with one atom of manganese($\mathrm{Mn}$) to form one molecule of manganese dioxide(${\mathrm{MnO}}_2$).
• Therefore, the valency of manganese is $2$