Question

Sort the following in increasing order of atomicity.

• A. $\text{He}$
• B. ${\text{O}}_2$
• C. ${\text{NH}}_3$
• D. ${\text{N}}_2{\text{O}}_3$
• E. ${\text{H}}_2{\text{SO}}_4$

Answer 1

Atomicity is defined as the total number of atoms in one molecule of a substance.

$$\begin{array}{ccc}\text{Molecule}& \text{Constituent Atoms}& \text{Atomicity}\\ He& \text{1 He}& \text{one}\\ O_2& \text{2 O}& \text{two}\\ N{H}_3& \text{1 N, 3 H}& \text{four}\\ N_2{O}_3& \text{2 N, 3 O}& \text{five}\\ H_{2}S{O}_4& \text{1 S, 2 H, 4 O}& \text{seven}\end{array}$$
Thus, the ascending order of atomicity is: $He$ < $O_2$ < $N{H}_3$ < $N_2{O}_3$ < $H_{2}S{O}_4$