arranged in order of increasing atomic number metals metalloidsnonmetals
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Arranged in order of increasing atomic number
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Metals Metalloids Nonmetals
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•Good conductors of heat and electric current•High luster or sheen (shiny)•Solids at room temperature (except for Hg)•Ductile•Malleable•MORE REACTIVE ON LEFT
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•Variation in properties•Not metals•Mostly gases at room temperature•Generally, poor conductors•Solids tend to be brittle
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•Properties similar to metals and nonmetals•Behavior (metal or nonmetal) depends on conditions
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When arranged in order of increasing atomic #, elementsshow similar properties within groups (this has to do withtheir electron configurations).
Group = columnPeriod = row
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•Most reactive metals: 1 VALENCE ELECTRON
AlkaliMetals
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Less reactive than Group 1A metals: 2 valence electrons
AlkalineEarthMetals
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•Most reactive nonmetals: 7 valence electrons
Halogens
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•“Inert Gases:” 8 valence electrons (except for He – 2)•Rarely react because highest energy level is FULL.
NobleGases
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•Transition metals
transitionmetals