Question

the smallest unit of matter is a(n) ______. choose one option a molecule b atom c covalent bond d electron

Explanation:

• Option A: A molecule is a group of atoms bonded together, so it's not the smallest unit of matter.
• Option B: An atom is the smallest unit of matter that retains the properties of an element.
• Option C: A covalent bond is a type of chemical bond, not a unit of matter.
• Option D: An electron is a subatomic particle, and matter is made of atoms (which contain electrons, protons, neutrons), but the smallest unit of matter is the atom.

Answer:

B. atom