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April 1, 2024
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Paulphisit Phet Dejchaiyasak
⟶ è stato aggiornato 15 set 2018 ⟶
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-First Idea of putting elements in a table -Group elements in Traite with 33 substances
Lavoisier, France (1789)
Dalton, England (1806- 1827)
-Defined atom -Removed heat and light -Discovered more elements to 36 substances. -Discovered the Basis of Atom Theory
Dobereiner, Germany (1817)
-Law of Triads -Group three elements with similar properties -First to arrange by atomic mass
Newlands, England (1865)
-Law of Octaves -Elements repeat every 8 elements -First to mention "periodicity" -Only work with small elements
Mendeleev, Russia (1869)
-The Periodic Law -Arrange by Atomic Weight, but atomic properties are the most important -Leftover gaps are the undiscovered elements
Moseley, England (1913)
-Discovered the Modern Periodic Table -Discovred Atomic Number -Fix all the mistake of Mendeleev's exp: apply new element/ fill gasp