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

Basic Chemistry Definitions

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