Alkali metal, Group 1 reactive metal, 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 an atom's electrons, Group/family, Vertical column on periodic table, Halogen, Group 17, very reactive nonmetal, Law of octaves, Properties repeat every eighth element, Luster, Shiny appearance of a substance, Malleable, Can be hammered into sheets, Metalloid, Element with metal and nonmetal properties, Metal, Shiny conductor that is malleable, Noble gas, Group 18 unreactive (stable) gas, Nonmetal, Poor conductor lacking metallic properties, Nucleus, Atom's center containing protons and neutrons, Orbital/shell/energy level, Region where electrons are found, Period, Horizontal row on periodic table, Periodic law, Elements arranged in the periodic table show predictable patterns, Transition metal, Metal in groups 3 through 12, Triad, Three similar elements with related masses, Valence electrons, Electrons in the outermost shell

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