-
Came up with theory that everything in the universe was made out of small tiny things called atoms. Democritus did not conduct any experiments and had very little evidence.
-
-
-
John Dalton created the threory of atomic weight by calculating the weight of the atoms in a water molecule. His theory was that there was more oxygen than hydrogen in water. His contribution to the atomic model was that all atoms in an element are identical and that atoms of different elements in whole numbers add up as compounds
-
-
Discovered the electron. He used a high vacuum cathode ray tube to study electrons. His experiment was called the plum pudding model because he had electrons floating around in a positivly charged soup
-
-
Ernest Rutherford used the gold foil experiment to prove the modern day atomic model. He found out through the experiment that the positivity charged particles were centralized towards the middle and the electrons or the negatively charged particles were towards the outside of the atom. He also found out atoms are mostly empty space.
-
-
-
Neils Bohr's model explained the Rydberg formula. This was new because Rutherford's model couldn't do this. Bohr's model only worked with the element hydrogen. The model also help lead to defining elements by the amount of electrons they had in there energy levels. Bohr also stated that electrons have fixed paths like the planets in orbit.
-
-
Bohr's model was good but not good enough. His model only explained where an electron was on a fixed path. Erwin's model gave the location of the electron. Erwin's model is more of a cloud of where you can find the electron. His model also introduced the idea of sub energy particles. Erwin's Model also stated that electrons can only have certain energy levels.
