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Everything made of building blocks. *550 BC
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Everything is made of atoms. *400 BC
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No one argued, all matter was fire, water, earth, air. *350 BC
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Dalton's Atomic Theory
1) All elements composed of indivisible atoms
2) Atoms of the same element are the same. Atoms of different elements are different.
3) Atoms make compounds.
4) Atoms are rearranged in chemical reactions. Not created. Not destroyed. Not changed -
First periodic table, sorted by weights, left gaps. Elements filled in the gaps later!
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Discovered the electron existence, but no details "cathode ray tube"
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Found charge of electron (1/2000 of atom), mass of atom
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Positive (protons) nucleus with electrons around. The nucleus was very tiny and very dense.
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Shot alpha particles at golden foil. They should habe gone straight through, but some bounced off showing there was a nucleus, and the rest was empty space.
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Electrons orbitted in rings (energy levels), could jump from orbit to emit energy
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Discovered neutron (masses weren't making sense)
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Nuclear research, created atomic bomb for WWII, separated the atom.
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Shroedinger- electrons are not necessarily
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BAZINGA!!!!