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Period: 490 to
Atomic Theory
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492
Democritus
Demoritus believed that all matter was made out of substances that could not be divided. -
John Dalton
John Dalton found that when elements such as hydrogen and oxygen combine, they always in certain ratios. -
JJ Thomson
Thomson believed that all matter is made of indivdual particals called atoms, which cannot be divided. -
Marie Curie
Marie hypothesized that radiation doesn't come from the molecule it comes from the atom. -
Max Plunck
he became considered the inventor of the quantom theory. -
Ernest Rutherford
rutherford fired atoms though gold foil and found out that atoms have parts of atoms that are free and some parts are solid