Periodic Table Test Study Guide
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Dmitri Mendeleev
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he arranged the elements into rows in order of increasing mass so that elements with similar properties were in the same column
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The Periodic Law
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the patter of repeating properties displayed by elements in the periodic table
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Groups and Periods
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groups- vertical line up down Periods- side to side horizontal
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Metals
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elements that are good conductors of heat and electric current
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Metalloids
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elements with properties that fall between those of metals and nonmetals
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Nonmetals
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elements that are poor conductors of heat and electric current
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Weighted Average of Isotopes
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examples on Notes #11
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Variation across a period
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the elements become less metallic and more non metallic in their properties
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Valence Electrons
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an electron that is in the highest occupied energy level of an atom Example on Notes #9
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Alkali Metals
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Group 1, atoms have 1 valence electron, never found in nature uncombined, and soft,silver-white, shiny metals
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Alkaline Earth Metals
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Group 2, atoms have 2 valence electron, soft, silver-white, shiny metals
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Boron Family
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Group 3, atoms have 3 valence electrons, aluminum is in this group
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Carbon Family
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Group 4, 4 valence electrons, elements called "basis of life" is in this group
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Nitrogen Family
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Group 5, have 5 valence electrons most abundant element in the earths atmosphere is in this group
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Oxygen Family
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Group 6, have 7 valence electrons
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Halogen Family
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Atoms share or gain 1 valence electron in chemical bonds, atoms have 7 valence electrons, most active nonmetals
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Noble gases
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Atoms have 8 valence electrons, do not normally react with other elements
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Bohr diagrams ad Lewis Dot Diagram
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Examples on Lewis notes #8 and Bohr on Notes #5
