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442
Democritus
Democritus proposed the first idea of the atom; "by convention bitter, by convention sweet, but in reality atoms and void." -
Period: 442 to
Atomic structure influences
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Antoine Lavoisier
Discovery of the role oxygen plays in combustion. He recognized and named oxygen and hydrogen -
John Dalton
Proposed an atomic theory with spherical solid atoms based upon measurable properties of mass.
- All matter is made up of atoms
- Atoms of the same element are the same -
JJ Thompson
Discovery of the electron -
Robert Milikan
Won the Nobel Prize for physics for his work on the photoelectric effect and measuring the charge of the electron. -
Niels Bohr
The discovery and creation of the atominc atom, helped aid what we know about atoms and how they function -
James chadwick
Discovered the neutron