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345
Aristole 345 bc
He thought atomic theroy was false thought that all things were made of fire water ice etc., he thought atoms were elements of matter -
450
Democritus 450 bc
He discovered that matter could be divide into smaller and smaller pieces until eventally the smallest piece was obtained. Look liked was small hard particles that were all made of the material but were different shapes and sizes -
Dalton
he said instead it was a mechinial system composed of small indiviual particles that was used people appiled by each gas independently. he stuided gases and learn that wasn't chemical slovent as other scienetist belive. he also thought they looked like tiny particles -
Thomson
He discovered the electon. in a series of experiments desgined to study tge nature of electric discharge in a high vaccum eating tube. -
Rutherford
he discovered the atomic nuclues a d orbiting electrons. he used the gold fail experiment. he also thought the atom had a tiny heavy nuclues -
Bohr
Created quanthan theroy. the improvement for this is the most quantran physics interpations. he model it a primitive model of the hydrogenatum and yes. As a small, postively charrged nuclues surrouned by electrons.