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Period: 500 BCE to 401 BCE
First Proponents of Atomic Theory
Greek philosophers Leucippus and Democritus proposed the following model, which was the beginning of the atom.
1. Matter is composed of atoms separated by empty space through which the atoms move.
2. Atoms are solid, homogeneous, indivisible, and unchangeable.
3. All apparent changes in matter result from changes in the groupings of atoms.
4. There are different kinds of atoms that differ in size and shape.
5. The properties of matter reflect the properties of the atoms the matter contains. -
460 BCE
Democritus was born
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460 BCE
Leucippus and Democritus's form of the atom
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John Dalton was born
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John Dalton
He arrived at his view of atomism by way of meteorology. He kept daily weather records from 1787 until his death -
John Dalton's first book: Meterorological Observations
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JJ Thomson was born
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Marie Curie was born
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Ernest Rutherford was born
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Niels Bohr was born
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Erwin Schodinger was born
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James Chadwick was born
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Louis de Broglie was born
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Werner Heisenberg was born
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Ernest Rutherford
Ernest and a colleague introduced their disintegration theory of radioactivity, which claimed if radioactivity energy was emited at the same time, they caused a chemical change across elements. -
Marie Curie
For their joint research into radioactivity, Marie and Pierre Curie were awarded the 1903 Nobel Prize in Physics. -
JJ Thomson created the Plum Pudding Theory
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Marie Curie received the Noble Prize
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Niels Bohr proposed the Bohr model
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Ernest Rutherford
He discovered how to artificially induce a nucleur reaction in a stable element. -
Niels Bohr won the Nobel Prize
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Louis de Broglie
He developed his revolutionary theory of electron waves -
Schodinger
He produced the paper that gave the foundations of quantum wave mechanics -
James Chadwick proved existence of neutrons
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Heisengburg
made his own principle of the Quantum Mechanics -
Louis de Broglie started his research for the Quantum theory
