History Of Chem Flashcards
Mass of proton
1.67E-24
Mass of electron
9.11E-28
Mass of neutron
1.67E-24
J. J. Thomson
Cathode ray showed negative charge and calculated mass of electron by difference of diffraction
Goldstein
Observed positively charged particles when perforated cathode plate was introduced. Not protons but residual gas
Soddy
Studied radioactive decay and proposed multiple masses which led to isotopes
Millikan
Measured charge on electron. Was able to use this to calculate mass.
Heisenberg
Uncertainty principle
Chadwick
Discovered neutron 1932
Marie Currie
Discovered Polonium and Radium
Unit of radioactivity and element named after her
Received two Nobel prices
Joseph Thompson
Discovered electron. Plum Pudding Model
Stern and Gerlach
Electron’s Spin
Becquerel
Radioactivity
Rutherford
Discovered proton. Beta particles from gold foil experiment.
Identified alpha, beta, gamma
Alpha particle
He 2+
Beta particle
Electron
Gamma particle
High energy light
Crooks Tube Experiment
Charge/mass ratio
Millikans oil drop
Charge on electron
Rutherfords gold foil
Charge distribution in atom, performed experiment to convert on atom into another
Becquerels photographic film experiment
Radioactivity
Röntgens evacuated crooks tube
Production of X-rays
Mendeleev and Meyer
Cocreators of the periodic table
Geiger and Marsden
Bombarded gold foil with alpha particles
