click below
click below
Normal Size Small Size show me how
Chem Quiz
Term | Definition |
---|---|
John Dalton | English Scientist, 1803 |
JJ Thomson | English Scientist, 1897 |
Robert Millikan | American Scientist, 1909 |
Ernest Rutherford | English Scientist, 1912 |
Neils Bohr | Danish Physicist, 1913 |
Eugen Goldstein | German Physicist, 1885 |
James Chadwick | English Scientist, 1932 |
John Dalton(description) | 5 Postulates to his theory, all matter is made up of small indivisible particles called atoms, atoms cannot be created nor destroyed in chemical reactions |
JJ Thomson(description) | Did research with a cathode ray tube, discovered the electron, his model is called plum pudding: all electrons and protons are evenly distributed |
Robert Millikan (description) | Determined the charge of an electron with oil drop experiment: suspended tiny charged droplets of oil between two metal electrodes by balancing downward gravitational force with upward drag and electric forces. |
Ernest Rutherford(description) | Did the gold foil experiment: When he shot a beam of alpha particles at a sheet of gold foil, a few of the particles were deflected. He concluded that a tiny, dense nucleus was causing the deflections. |
Neils Bohr(description) | Solar Sytem model: Depicts atom as small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus |
Eugen Goldstein(description) | Used a cathode ray tube filled with hydrogen gas and discovered the charge and mass of a proton |
James Chadwick(description) | Found evidence for existence of the neutron and the discovery of what makes up the total mass of an atom, experiment:Beryllium, when bombarded by alpha particles, emitted a very energetic stream of radiation, electrons mass is negligible |