Alkali metal, Group 1 metal, very reactive, Alkaline earth metal, Group 2 reactive metal, Atomic number, Number of protons in nucleus, Brittle, Breaks or shatters easily, Ductile, Can be drawn into wire, Electron configuration, Arrangement of electrons in atom, Group/family, Vertical column on periodic table, Halogen, Group 17 very reactive nonmetal, Law of octaves, Properties repeated every eighth element, Luster, Shiny appearance of a substance, Malleable, Can be hammered into sheets, Metalloid, Has metal and nonmetal properties, Metal, Good conductor, usually shiny, Noble gas, Group 18 unreactive gas, Nonmetal, Poor conductor, often dull, Nucleus, Dense center with protons and neutrons, Orbital/shell/energy level, Region where electrons are found, Period, Horizontal row on periodic table, Periodic law, Properties repeat with atomic number, Transition metal, Metal in groups 3 through 12, Triad, Three elements with similar properties, Valence electrons, Electrons in outer energy level

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