the periodic table of elements. history of the periodic table 1869 : dmitri mendeleev considered the...
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History of the Periodic Table
• 1869 : Dmitri Mendeleev
• Considered the father of the periodic table of elements
• Periodic - happening at regular intervals
Mendeleev’s Table
• Organized by atomic mass
• Was able to predict the existence of the element Ge based on its properties
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Alkali Metals
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• Group 1 or IA
• Single e- in outer energy level (valence e-)
• Soft, Silvery white & Shiny
• The most reactive metals
• Never found “free” in nature (always in a cmpd)
• Soaps are formed when alkali metals react with fat
What does MacGyver think about alkali metals???
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Alkali metals react violently with water.
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Alkaline Earth Metals
• Group 2 or IIA
• Have 2 valence e-
• Not as reactive as alkali metals
• Produce strong, lightweight alloys
• Never found “free” in nature
Good Conductors of heat & electricity
Good Conductors of heat & electricity
Have lusterHave luster
Form compounds in a variety of ways
Form compounds in a variety of ways
Brightly coloredBrightly colored
Transition Metals
Groups 3-12
Transition Metals
Groups 3-12
Common Transition Metals
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Steel
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Gold & Silver
The Halogen Family
• Group 17 or VII A
• Have 7 valence e--
• Never found free in nature
• The most reactive non-metals
• Form salts when they combine with metals
FF
ClCl
BrBr
II
Properties/Reactivity of the Halogens
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The Inert Gas Family• Also called the Noble Gas
Family
• Group 18 or VIIIA
• Have 8 valence e-
• Considered un-reactive
• Glow bright colors when energized
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