Question

Historical development of atomic theory

Answer 1

It was the English chemist, John Dalton, who put the pieces of the puzzle together and developed anatomic theory in 1803. Dalton 'satomic theory contains five basic assumptions: All matter consists of tiny particles called atoms. ... Elements are characterized by the weight of their atoms.

Answer 2

$\large\tt\red{Refer\:The\:Above\: Attachment\::)}$