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B
Democritus
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C
Dalton
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D
William Crookes
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Solution
The correct option is A Maharishi Kanad
John Dalton (1766 – 1844), an English chemist and physicist, is the man credited today with the development of atomic theory. However, a theory of atoms was actually formulated 2,500 years before Dalton by an Indian sage and philosopher, known as Acharya Kanad.