What is an atom, element, molecule, and compound? What is an example of each?

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Solution

Atom
Atoms are the fundamental building blocks of the matter.
It is the tiniest unit of matter.
For example, $Na$ (sodium) atom, $F$ (fluorine) atom, etc.
Molecule
A molecule is in general a group of two or more atoms that are chemically bonded together, that is, tightly held together by attractive forces..
For example, $H_{2} O$ (water), $N_{2}$ (nitrogen), etc.
Element
Element is the composition of the same type of atoms that can not be broken down into simpler form by any physical or chemical methods.
For example, $C$ (carbon), $Kr$ (krypton), etc.
Compound
A compound is a substance composed of two or more different elements combined together in a fixed ratio.
For example, $NaCl$ (sodium chloride), ${CaCO}_{3}$ (chalk), etc.

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