Find the total number of elements that show allotropy.

$\mathrm{C}, \mathrm{N}, \mathrm{P}, \mathrm{As}, \mathrm{Sb}, \mathrm{Bi}, \mathrm{O}, \mathrm{Si}, \mathrm{Se}$

The ability of some chemical elements to exist in two or more distinct forms while remaining the same physical state is known as allotropy.
Nitrogen does not show allotropy in the given compound because of its tiny size and strong electronegativity.
All components exhibit allotropy when resting.

Nitrogen does not show allotropy because of its small size and high electronegativity.

$\text{ C, P, As, Sb, Bi, O, Si, Se }$