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440 BCE
Democritus
Atom are "Uncuttable"
Atoms are small, hard particles
Atoms constantly move -
440 BCE
Democritus
Atomos -
Period: 440 BCE to
Atomic Theory
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John Dalton
Atomic Model -
John Dalton
All substances are made of atoms
Atoms of different elements are different
Atoms of the same element are exactly alike -
J.J. Thomson
Plum Pudding Model -
J.J Thomson
His theory of the atomic structure lead to the "plum-pudding" model -
Ernest Rutherford
Atoms contain mostly empty space -
Ernest Rutherford
Nuclear Model -
Niels Bohr
Electrons jump between levels from path to path -
Niels Bohr
Planetary Model -
Erwin Schrodinger and Werner Heisenberg
Electron paths cannot be predicted
Electrons are found in electron clouds, not paths -
Erwin Schrodinger and Werner Heisenberg
Cloud Model
