Question

introduction of atom, molecules, elements and compounds​

Answer 1

atom is the smallest part of an element which can't exist freely.
molecules is the smallest part of element which exist freely.
molecule r combination of two or more atoms.
smallest part of a substance which cannot be broken down into simpler substance.
compounds are also known as molecules.

Answer 2

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Explanation:

Atom: An atom is the smallest particle of molecule.

Molecule: An molecule is the smallest particle of element.

Compound: The mixture of more than two substances is known as compound.

Element: An element is a pure material of a substance.