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John Dalton
John Dalton discovered the Atomic theory, and said that atoms were balls. Later on his atomic theory was proven to be right, but his model was incorrect. This discovery was important because it lead to other discoveries and helped uncover what atoms look like, and what they consisted of. -
J.J. Thomson
J.J. Thomson was responsible for the discovery of the electron. He used cathode rays to prove that electrons existed. His discovery was the first sub- atomic particle discovery. He also was the first to find evidence of isotopes of stable atoms. His discoveries were important because it was the first time that a scientist proved that the atom could be subdivided. -
Marie Curie
Marie Curie was responsible for developing the theory of radioactivity. She also discovered Polonium and Radium. She won 2 Nobel Peace Prices. One was in 1903 and the other one was in 1911. -
Rutherford
This was the gold foil experiment. They have positive nucleus called protons. The atoms were mostly in empty space. This is important because he was the one that proved atoms are mostly empty space. -
Bohr
This was the paltry model. This developed the idea that there are be heels and orbitals of electrons. The is important because he was the one that developed the electron and he is the one that said that the electrons orbit around it. -
Chadwick
He used the gold foil expieriemnt to look at the "missing" mass problem neutron. He completed the modern atomic model. This is important because he discovered the neutron.
