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Period: 460 BCE to 370 BCE
Democritus
His atomic theory was his contribution to the structure of the atom. He said that everything is made of atoms -
370 BCE
Democritus
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Period: to
John Dalton
His theory said that there were atoms of different size and mass to make different elements. -
Period: to
Dmitri Mendeleev
He made the diagram of known elements -
John Dalton
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Period: to
Eugene Goldstein
He discovered protons and electrons in atoms -
Period: to
J.J. Thomson
He discovered that electrons are negatively charged -
Period: to
Max Planck
He contributed to the understanding of atomic and subatomic processes -
Period: to
Robert Millikan
He discovered the value of electron charges -
Period: to
Ernest Rutherford
He found that JJ Thomson's theory was incorrect and that the atom was mostly empty space with electrons around a massive nucleus -
Period: to
Niels Bohr
Proposed a theory for a hydrogen atom -
Period: to
Erwin Schrodinger
He made the quantum mechanical model of the atom -
Period: to
James Chadwick
He discovered that the core of the atom contained a neutron -
Period: to
Werner Heisenberg
He made the theory of quantum mechanics -
Dmitri Mendeleev
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Eugene Goldstein
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Ernest Rutherford
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J.J. Thomson
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Max Planck
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Robert Millikan
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Erwin Schrodinger
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Niels Bohr
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James Chadwick
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Werner Heisenberg
