Chemistry Unit 3 - The Atom and the Periodic Table
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19 Terms
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Atomos
“Not to be cut”
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Democritus
\- Greek philosopher
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\- Matter could not be divided into smaller and smaller
“a tomos”
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\- Matter could not be divided into smaller and smaller
“a tomos”
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John Dalton
\- “Atomic Theory of Matter”
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J. J. Tompson
\- Discovered the electron (cathode rays)
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\- Plum Pudding Model
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\- Plum Pudding Model
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Lord Ernest Rutherford
\- Gold Foil experiment
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\- Found the nucleus
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\- Found the nucleus
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Niels Bohr
\- Bohr Model (2,8,8,18)
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\- Electrons move in definite orbits
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\- Electrons move in definite orbits
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James Chadwick
\- Discovered the neutron
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Dmitri Mendeleev
Made the basic formula for the periodic table
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Periods
Run horizontally across the Periodic Table
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Group
Contain elements with similar attributes
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Group 1 - Alkali Metals
\- Very reactive (most reactive group)
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Group 2 - Alkaline-Earth Metals
\- Very reactive
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Groups 3-12 - Transition Metals
\- Higher density
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\- Good conductors of heat and electricity
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\- Good conductors of heat and electricity
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Group 13 - Boron Group
\- Solid at room temp.
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Group 14 - Carbon Group
\- Solid at room temp.
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Group 15 - Nitrogen Group
\- All but Nitrogen are solid at room temp.
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Group 16 - Oxygen Group
\- All but Oxygen are solid at room temp.
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Group 17: Halogens
\- Poor conductors of electric current
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Group 18 - Noble Gases
\- Least reactive group
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\- All found in atmosphere
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\- All found in atmosphere
Note 
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