What is an atom,molecule and atomicity of a substance?

Atoms: The atom is the smallest indivisible particle of a substance that can't exist independently, atom is also composed of subatomic particles protons, neutrons, and electrons. The subatomic particles proton, neutron, and electron were discovered by Goldstein, Chedwik, and J.J Thompson respectively. Although atoms and its subatomic particles can't be seen directly by a device, scientists experiment on the observation of the different kinds of phenomena due to the content of matter shows the existence of atom and its subatomic particles. Atoms are as small as that even the tip of a needle can accommodate more than 1 lakh atoms.
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