Atomic Structure

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Atomic Structure

Dalton

Atoms are small indivisible particles

Atoms of different elements vary in mass

The law of conservation of mass states that matter is neither created nor destroyed over the course of a chemical reaction.

Crookes

showed that cathode rays travelled in straight lines from the cathode of a battery

proved via maltese cross

Discharge Tube is an apparatus with two metal electrodes, in a near vacuum

JJ Thomson

Found that cathode rays had a negative charge

Stoney

Discovered the electron

Millikan

Oil Drop Experiment

Oil Drop Experiment has charged oil cloud dropped between positive and negative plates, causing it to be suspended mid-air

Plum Pudding Model is a model of an atom with a positive sphere with negative particles embedded throughout

Rutherford proposed the gold foil experiment, in which alpha particles were beamed through the gold foil

This showed that the atom was mostly empty space

Isotopes are elements with different numbers of neutrons