Question

tell me some basic points about atoms and molecules?

Answer 1

Can you be more specific?

Answer 2

All Elements are composed of extremely small particles called atoms. Atoms are composed of a central nucleus and negatively charged subatomic particles called electrons outside the nucleus. The nucleus of an atom is composed of two types of subatomic particles : protons, which have a positive charge, and neutrons, which have no charge. The number of protons in an atom is called it's atomic number.
Each element is designated by a symbol, and has it's own unique atomic number.

Protons are the normal circles
Neutrons have the ring inside them
Electrons are coloured in.