01 Notes - History of the Atom

01 Notes - History of the Atom - 3. Compounds form by 2 or...

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Pluchino Regents Chemistry Atomic History and Electron Configuration – 01 History of the Atom Aim: How has the theory of the atom evolved over time? Do Now: Name that scientist! Democritus: First to suggest concept of atoms There is a point where matter can no longer be divided and maintain its properties Lavoisier: Proved the law of conservation of matter Compiled the first complete list of elements Introduced the metric system Proust: Discovered the law of definite proportions (water will always be H 2 O) Dalton: First modern atomic theory Develop the law of multiple proportions (carbon and oxygen can form CO or CO 2 ) Billiard ball model of the atom Billiard Ball Model of the Atom 1. Matter is made of indestructible atoms 2. All atoms of an element are identical
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Unformatted text preview: 3. Compounds form by 2 or more elements combining 4. Reactions are rearrangements of atoms J.J. Thomson: Discovered the electron by working with cathode ray tubes Plum pudding model Plum Pudding Model The atom itself is positive with electrons scattered throughout it to maintain neutrality. Millikan: Found the charge of the electron: 1.6x10-19 Coulombs Rutherford: Gold foil experiment Atom is mostly empty space Discovered the nucleus (small, dense, positively charged) Pluchino Regents Chemistry Nuclear Atom Conclusions: The model of the atom has changed greatly over time Numerous scientists made contributions Billiard ball Plum Pudding Nuclear...
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01 Notes - History of the Atom - 3. Compounds form by 2 or...

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