Question

________ is the smallest unit of matter that can take part in a chemical reaction.

• A. Atom
• B. Molecule
• C. Compund
• D. Element

Answer 1

The correct option is A

Atom

Explanation of correct option:

A: Atom.

According to Dalton's atomic theory, atoms are the smallest unit of matter that can take part in a chemical reaction.

Explanation of incorrect options:

B: Molecule.

Molecules take part in chemical reactions indirectly as they are a group of atoms.

C: Compound.

These are formed by the combination of two or more different atoms.

D: Element.

Atoms of the same type join together to form an element.

Hence, option A is correct.