Who was the first person to come up with the theory of atoms? What were his ideas on the subject?
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Greek philosophers Leucippus and Democritus first developed the concept of the atom in the 5th century B.C.E.

Explanation:

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Explanation:

Democritus is usually credited with inventing the idea of the atom in about the 4th or 5th century BC. He believed that everything was made up of tiny particles that he called atoms, which in Greek means "indivisible". He thought that they made up all solid matter, and that they existed eternally.

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