Historical Development of Atomic Theory By The Vin Man 400 BCE Democritus Proposed that matter was composed of tiny indivisible particles called atomos. 1807 John Dalton Proposed ‘Billiard Ball’ model – atom is a uniform solid sphere.
Proposed that matter was composed of tiny indivisible particles called atomos.
Proposed ‘Billiard Ball’ model – atom is a uniform solid sphere.