Classify each of the following on the basis of their atomicity:

${\mathrm{H}}_2{\mathrm{O}}_2$

Classify each of the following on the basis of their atomicity:

${\mathrm{P}}_4{\mathrm{O}}_{10}$

Classify each of the following on the basis of their atomicity:

${\mathrm{O}}_3$

Classify each of the following on the basis of their atomicity:

$\mathrm{HCl}$

Classify each of the following on the basis of their atomicity:

${\mathrm{CH}}_4$

Classify each of the following on the basis of their atomicity:

$\mathrm{He}$

Classify each of the following on the basis of their atomicity:

$\mathrm{Ag}$