Question

who first gave the idea of an atom?​

Answer 1

Answer:

Democritus and Leucippus

The ancient Greek philosophers Democritus and Leucippus recorded the concept of the atomos, an indivisible building block of matter, as early as the 5th century BCE.

Answer 2

Answer:

Democritus

Around 450 B.C., the Greek philosopher Democritus introduced the idea of the atom. However, the idea was essentially forgotten for more than 2000 years. In 1800, John Dalton re-introduced the atom. He provided evidence for atoms and developed atomic theory.