1. This refers to a unit for counting the number of particles.

2. This is the number of particles in one mole of a substance which is equal to 6.02 x 10²³.

3. This is taken by multiplying the number of moles of a substance with the Avogadro's number.

4. This is taken by dividing the number of particles of a substance by the Avogadro's Number.

5. This is a term used to refer to the atoms, ions, or molecules and formula units of substances.​