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The Periodic Table
The Modern Periodic TableArranged in order of increasing atomic number
Properties of ElementsMetals Metalloids Nonmetals
Metals – MOST of the Periodic TableGood conductors of heat and electric current High luster or sheen (shiny) Solids at room temperature (except for Hg) Ductile Malleable MORE REACTIVE ON LEFT
Nonmetals – upper right cornerVariation in properties Not metals Mostly gases at room temperature Generally, poor conductors Solids tend to be brittle
Metalloids – the “stairstep”Properties similar to metals and nonmetals Behavior (metal or nonmetal) depends on conditions
Periodic Law When arranged in order of increasing atomic #, elementsshow similar properties within groups (this has to do with their electron configurations). Group = column Period = row
Group 1A: Alkali Metals Most reactive metals: 1 VALENCE ELECTRON
Group 2A: Alkaline Earth MetalsLess reactive than Group 1A metals: 2 valence electrons Alkaline Earth Metals
Group 7A: Halogens Most reactive nonmetals: 7 valence electrons
Group 8A: Noble Gases “Inert Gases:” 8 valence electrons (except for He – 2) Rarely react because highest energy level is FULL. Noble Gases
B-Groups: Transition Metals
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