-
384
Aristotle
he stated that the 4 elements we needed to live were earth,water,air,and fire. -
400
Democritus
he proposed that atoms are indistructable and that at that time he said atoms are solids but invisible and that they are homogeneus.He also said they were conected together by seams and they can only be seperated in the seam area. -
John Dalton
John Dalton invented the most useful atom theory around 1803 he said that atoms cannot be seen by microscopes, and that water vapor in the air is an independent gas. -
JJ. tompson
Jj tompson described that atoms are the building blocks of matter. -
robert millkan
Robert millkan measured the charges on an electron with the apartus.
