history of the atom timeline

Suggested the existence of the atom. He believed atoms were indestructable and indivisible.https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcSHzT3Afp79UQxgfB6TmO8m7fEFNQ-pl6Kqqh4b0fFatCcDuqnODg

Pictures atoms as super small particles with no internal structure.

Dalton's proposes his atomic theory.https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcSFemSMQWzWEgAIhC-G8POOSvK_z1SYQ__ljsWg3onqMEvJGNDZ4A

He invented the crooks tube, whichas you took the gas from a tube, a glow would show up if you place a high voltage across it. He noticed that a shadow would be created if something was placed in the tube, so he thought some new sort of light was being made. He called these rays - cathode rays.https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcRUWMuND4oy_IuAvf6JK_jA7CG2xyriAYZFCfeYRm8MCb6FmrU8

Looked at a cathode ray tube and found rays traveling in the opposite direction of the cathode ray. This gave proof for the positively charged particle called a proton.https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQdyoa4S_xe2aIzh2dY6VY3SGXTORs_yMxDa7-w0VB6rtUJABIs

Discovered the electron. This later leads to his "plum-pudding" model. He shows a showed electrons embedded in a sphere of positive electrical charge.https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTtPUHVKO8b-EA1CPTWymURgMJmxI4FXSvSnosqhIX4EA9DVMKI8w

Developed an early but incorrect planetary model of the atom. Although this model was wrong it let to the discovery of the atoms rings.https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcRpk2X6HX8lwYX5AhyAuf2ZdVEnfqZO7oDB6R8WwLY3lgM6VmnLzA

Discovered atoms have a small dense positively charged nucleus with electrons moving around it. https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTBEmDG_khGLyz65W657juOAWxawtLVBvJ83SR4Ks70541Hg2SZ

Believed the electron moved in a circular orbit at fixed distances from the nucleus.https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcThKTtigZokcsL9MCRkC1HqFNmXsxLmFfbSYZs7ZzpjVeGIGA5_Fg

Found out how to calculate the mass of an electron.https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcRs9OCcFgbD9ZTyiGulzR3WMSS06yd0ss3SozoooPl2GMXVFOlc