Answer:
An atom is the smallest particle.
Step-by-step explanation:
An atom is an smallest particle of the covalent compound that has the properties of compound.
Atom is the smallest particle that take part in chemical reaction and atoms are made up of particles called electrons, protons and neutrons, which is responsible for the charge of the atoms.
The smallest unit of compound is called molecule. Molecules are made up of atoms which is connected by bond by sharing of electrons and molecules have also the properties of compound.