P Block Elements

$\mathrm{PH}_3$ shows lower proton affinity than $\mathrm{NH}_3$.

$\mathrm{SO}_2$ can act as an oxidizing agent, but not as a reducing agent.

$\mathrm{NO}_2$ can dimerise easily.

$\mathrm{PF}_3$ exists but $\mathrm{NF}_5$ does not.