Ais a representation of a compound that gives the number of atoms and types of atoms in a compound.

Atoms are the smallest particle that has any of the properties of the element.
Compounds are made from atoms of different elements combined in simple whole numbers.
A molecular formula is a representation of a compound that gives the number of atoms and types of atoms in a compound. It consists of the chemical symbols for the constituent elements followed by numeric subscripts describing the number of atoms of each element present in the molecul.