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Democritus was an ancient greek philosohper born in Abdera. first person to come up with the idea that things are made up of atoms.
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He was responsible for the discovery and naming of the element, oxygen.
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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 was a Russian chemist and in 1869 he discovered 63 elements.
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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
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He discovered that there are elctrons surrounding the nucleus of an atom
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J.J thomson proposed this model and he discovered that there was a electron in the atom
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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 -
Is a American physicist born in 1868. he was famous for discovering the measure of a charge in a electron
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He discovered the atom wasnt the smallest unit he discovered it had a nucleus made of protons, neutrons and electrons
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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
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Niels Bohr was the one who discovered that the electrons in an atom followed an orbit that circulated the atom
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