Question

Identify the example of a molecule of an element from the following options.

• A. $O_2$
  
• B. ${\text{NH}}_3$
  
• C. $H_{2}S$
  
• D. ${\text{CH}}_4$
  

Answer 1

The correct option is A $O_2$


Elements are pure substances made up of only one kind of atoms. An oxygen molecule $\left({\text{O}}_2\right)$ is the molecule of an element as it contains only oxygen atoms in it.

However, hydrogen sulphide $\left({\text{H}}_2\text{S}\right)$, methane $\left({\text{CH}}_4\right)$ and ammonia $\left({\text{NH}}_3\right)$ are molecules of compound in which the different constituent elements are chemically combining with each in a definite ratio.