Question

Who discovered atom.
Ans.
Who derived atom
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Answer 1

Answer:

Atoms are the smallest unit of elements; atoms combine to form molecules, the smallest unit of compounds.

The idea of atoms stretches back to ancient Greece when the philosopher Democritus declared that all matter is made of tiny particles. The philosopher Plato even decided-- wrongly-- that different substances had different shaped atoms, like pyramids or cubes.

The first direct observation of atoms was in Brownian motion.  Analysis of Brownian motion gave accurate sizes for atoms (10−10 m on average) and a precise value for Avogadro’s number.

The first modern evidence for atoms appears in the early 1800s when British chemist John Dalton discovered that chemicals always contain whole number ratios of atoms. That's why it's H2O and not it's H20.4O or H square root of 17O.