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Democritus
He proposed an idea that matter is made up of tiny, indivisible, indestructible particles called atoms, but he did not have the necessary equipment to test his idea, and his ideas were rejected . -
John Dalton
He had ideas for the atomic theory. Some ideas were that its impossible to divide or destroy any sort of atom, most atoms are made if the same elements. He discovered that atoms are small tiny particals and other propertes -
J.J. Thomson
He discovered the electron when he was in his lab experimenting with gas discharge tubes. He noticed a movement in tubes he called them cathode rays, the rays moved from the negative end of the tube to the positive end of the tube. He discovered electrons -
Lord Ernest Rutherford
He conducted the gold foil experiment. He used thin sheets of gold foil and special equipment to shoot alpha particles at the foil. He found out that atoms are mostly empty space. -
Nield Bohr
He proposed a model of the atom that was similar to the solar system the electrons go around like the planets going around the sun. The circle around the nucleus are called shells
