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Antoine Lavoisier
He proved that matter was neither gained nor lost during a chemical reaction using careful observations of the oxidatin of tin.
"Atom." Wikipedia. Wikimedia Foundation, 31 Oct. 2013. Web. 03 Nov. 2013. -
Joseph Proust
He proved the law of definite proportions.
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John Dalton
He formed the atomic theory, which states that all matter is composed of tiny, indestructible particles called atoms that are all alike and have the same atomic weight.
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William Crookes
he discovered cathode rays had the following properties: travel in straight lines from the cathode, cause glass to fluoresce, impart a negative charge to objects they strike, are deflected by electric fields and magnets to suggest a negative charge, and cause pinwheels in their path to spin indicating they have mass.
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J.J Thomson
He discovered the electron and developed the plum-pudding model of the atom.
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Marie Curie
She discovered radium and polonium investigating radioactive substances.
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Max Planck
He came up with the quantum theory.
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Albert Einstein
He thought that light was made up of different particles that behaved like waves and particles. He also late developed the theory of relativity and the equation e=mc² which would be crucial to developing the atomic bomb that was dropped of Japn in WW2 and for the arms race betwwen the Soviet Union and the United States after WW2.
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"World War II." Wikipedia. Wikimedia Foundation, 11 Mar. 2013. Web. 03 Nov. 2013. -
Ernest Rutherford
He used the results of his gold-foil experiment to state that all the mass of an atom was in the nucleus at the center of the atom. He was also the first to split and atom and discover fission.
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Neils Bohr
He stated that the electrons moved around the nucleus in orbits. He also presented the Bohr atomic model.
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WW1 begins
"World War I." Wikipedia. Wikimedia Foundation, 11 Jan. 2013. Web. 03 Nov. 2013. -
WW1 ends
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Louis de Broglie
He discovered that electrons had a dual nature-similar to both particles and waves. Particle/wave duality. Supported Einstein.
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Erwin Shroedinger
He viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom.
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Friedrich Hund
He discovered quantum tunnelling.
"Friedrich Hund." Wikipedia. Wikimedia Foundation, 11 Jan. 2013. Web. 03 Nov. 2013. -
Werner Heisenberg
He published the uncertainty principle.
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James Chadwick
Using alpha particles he discovered the neuton a particle with a mass close to a proton.
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Hitler comes to power
"Adolf Hitler." Wikipedia. Wikimedia Foundation, 11 Jan. 2013. Web. 03 Nov. 2013. -
Murray Gell-Mann
With the help of George Zweig, he brought forth the idea of "quarks", little bits of matter which when used kind of like building blocks, explain some complex chemical substances.
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