Question

Which of the following cannot act as central atom?

• A. $H$
• B. $F$
• C. $O$
• D. Both $\left(a\right)$ and $\left(b\right)$

Answer 1

The correct option is D Both $\left(a\right)$ and $\left(b\right)$

The valency of $H$ is one and hence it cannot act as a central atom. $F$ is the most electronegative element and its valency is also one and hence it cannot act as a central atom.
Oxygen acts as a central atom in $O{F}_2$ and $H_{2}O$.

Thus, both $H$ and $F$ can not act as central atom.