Question

What is the formula for finding the atomicity of an atom or element?

Answer 1

Atomicity:

• Atomicity is defined as the number of atoms present in the molecule of an element.
• For example, ${\mathrm{N}}_2$ has atomicity 2.

Atomicity formula:

• The formula of atomicity is as follows.

$\mathrm{Atomicity}=\frac{\mathrm{molecular}\mathrm{mass}}{\mathrm{atomic}\mathrm{mass}}$

• For example, the atomicity of ${\mathrm{N}}_2$ is calculated as follows.

The atomic mass of nitrogen = $14\mathrm{g}{\mathrm{mol}}^{-1}$

The molecular mass of nitrogen = $28\mathrm{g}{\mathrm{mol}}^{-1}$

$\begin{array}{rcl}\mathrm{Atomicity}& =& \frac{\mathrm{molecular}\mathrm{mass}}{\mathrm{atomic}\mathrm{mass}}\\ \mathrm{Atomicity}& =& \frac{28}{14}\\ \mathrm{Atomicity}& =& 2\end{array}$