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Period: 300 to
Atomic theory timeline
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460
Democritus
Democritus was an ancient greek philosohper born in Abdera. first person to come up with the idea that things are made up of atoms. -
Antoine Lavoiser
He was responsible for the discovery and naming of the element, oxygen. -
John Dalton
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Dalton's Atomic Theory
this was his theory:
All matter is composed of atoms
Atoms cannot be made or destroyed
All atoms of the same element are identical
Different elements have different types of atoms
Chemical reactions occur when atoms are rearranged
Compounds are formed from atoms of the constituent elements. -
Dmitri Mandeleev
Dmitri Mandeleev was a Russian chemist and in 1869 he discovered 63 elements. -
Cathode Ray Tube
Thomson's Cathode Ray tube showed that glass tube can have wires inserted in both ends and the air removed would make a glow for example our light bulbs -
Erwin Schrodinger
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Joseph John Thomson
He discovered that there are elctrons surrounding the nucleus of an atom -
Plum Pudding Atomic Model
J.J thomson proposed this model and he discovered that there was a electron in the atom -
Gold Foil Experiment
Ernest Rutherford did
The gold foil experiment and it was done to find out if the mass of an atom was at the centre of it. and after the experiment it was discover the nucleus -
Robert Millikan
Is a American physicist born in 1868. he was famous for discovering the measure of a charge in a electron -
Rutherford Model
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Ernest Rutherford
He discovered the atom wasnt the smallest unit he discovered it had a nucleus made of protons, neutrons and electrons -
Bohr Planetary Model
this explained that the nucleus had atomic energy in this model it told us that there are neutron and protons that are in the nucleus -
Henry Moseley
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Neil Bohr
Niels Bohr was the one who discovered that the electrons in an atom followed an orbit that circulated the atom -
Electron Cloud
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Quantum Mechanical Model
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James Chadwick
