Question

A substance that contains chemically similar atoms, and the atoms always exist in pairs. What is that substance called?

• A. Solution
• B. Element
• C. Compound
• D. Mixture

Hint:

Remember: \[ \boxed{ \begin{aligned} \text{Element} &\rightarrow \text{Only one type of atom}\\ \text{Compound} &\rightarrow \text{Two or more different atoms chemically combined}\\ \text{Mixture} &\rightarrow \text{Physical combination of substances} \end{aligned} } \] Many elemental gases exist as diatomic molecules such as \(H_2,\;N_2,\;O_2,\;Cl_2\).

Answer 1

The Correct Option is B

A substance whose molecules always contain chemically similar atoms in pairs is a homodiatomic element, meaning a diatomic molecule formed from two identical atoms. Common examples are $H_2$, $O_2$, $N_2$, $F_2$, $Cl_2$, $Br_2$, and $I_2$, all of which are elemental substances rather than compounds.