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He has determined between an element and a compound.He has also introduced the formula for conservation of matter in chemical reactions.
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He has formulated the couloumb law.
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John Dalton has formed the atomic theory. The atomic theory states that all matter is composed of tiny, indestructible particles called atoms that are all alike and have the same atomic weight.
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Crookes has demostated that cathode rays travel in straight lines and also produce heat when they strike other materials. Crookes has also created the Crookes' Tube.
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Becquerel had discovered radioactivity.
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J.J Thomson created th plum pudding model of an atom. He has also discovered the electron.
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Max planck oriinated the quantu theory.
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He made the theory of Relativity
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Robert Millikan figured out the electric charge of an atom.
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He had stated from the results of the gold foil experiment that all the mass of an atom were in a small positively charged ball at the center of the atom.
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Neils Bohr made the Bohr atomic model and it stated that that atoms absorb or emit radiation only when the electrons abruptly jump between allowed, or stationary, states.
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Chadwick had discovered nuetrally charged nuetrons.
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Otto Hahn had discovered nucleur fission.
