Which of the following is the chemical formula of phosphorous pentoxide?

The chemical formula of phosphorous pentoxide is ${\mathrm{P}}_4{\mathrm{O}}_{10}$.
The chemical formula ${\mathrm{P}}_4{\mathrm{O}}_{10}$ designates phosphorous pentoxide. Phosphorus is a non-metal that forms bonds by sharing or gaining electrons, as they cannot lose electrons like metals. Thus phosphorus forms a covalent compound with oxygen which is also a non-metal.