Who suggest matter was made up of atoms?

Answer 1

Democrit from Abdera, approx. 2 500 years ago.

Answer 2

The idea that matter is made up of atoms was suggested by ancient Greek philosophers such as Democritus and Leucippus around the 5th century BC. They proposed that everything in the universe is composed of indivisible particles called atoms. This idea was further developed and supported by scientists such as John Dalton in the 19th century.