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1. Hypothesis

Any material can be broken into smaller parts.
Breaking these small parts of the material further results in much smaller parts.
Philosopher Kannad introduced the concept of anu.
The philosophy is that any material consists of smaller parts of itself.
Greek philosophers proposed similar philosophy of material and its composition.
Any matter is a composition of small and indivisible particles of its nature.
These indivisible particles were known as atoms.
Atom is a Greek word.
Models of atom were proposed by the following scientist.

Dalton model
Thomson model
Rutherford’s model
Bohr’s model (Electron moves in circular orbit)
Sommerfeld’s model (Electrons move in elliptical orbit)

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