Chem Ch. 3 People

9 cards·by moemoe

John Dalton

1st to write a theory of the atom based on experiments

Democritus

1st to propose that matter was not infinitely divisable and that all matter is made up with marble like structres called atoms

Crookes

discovered a flash of light within a cathode ray tube

J.J Thompson

proved atoms had a charge, called his model the plum pudding model

Rutherford

used gold foil experiment to test how alpha particles effect matter

Aristotle

rejected the concept of the atom, 4 element theory: air, earth, water, fire

2 characteristics of Rutherfords atoms

1. the atom is mostly space 2. the atoms has a very dense positivly charge nucleus

Millikan

calculated the mass of an electron with his oil drop experiment

Chadwick

discovered the neutron with in the nucleus, found it to have no carge