-
Dalton
Dalton proposed that all matter is made of atoms and that these atoms cannot be broken into smaller particles. -
Avagadro's law
"At the same temperature and pressure, an equal number of moles of ANY GAS will occupy the same volume." -
Thompson
Thompson came up with the "plum pudding model" for the atom. He was the first scientist to propose that the atom was not the smallest particle but in fact contained small negative particles called electrons. He proposed that these electrons sat in a positive jelly like plums in a plum pudding. -
Ernest Rutherford
Ernest Rutherford fired alpha particles (tiny positively charged particles) at a thin sheet of gold foil and found out that although most alpha particles went straight through the sheet, some were deflected or even reflected back towards their source. -
Neils Bohr
The 3 postulates of Bohr’s atomic model.
-Electrons orbit around the nucleus without losing energy.
-Only some orbits are permitted.
-Electrons change of orbit by absorbing or emitting the difference of energy between the initial and final level.