periodic table, chart of the elements arranged in rows and columns, group, a column in the periodic table , periods, rows in the periodic table, metal, element that is generally shiny, pulled into wires, conducts electricity and thermal energy, luster, the ability of a metal to reflect light, ductility, the ability to be pulled into thin wies, malleability, the ability of a substance to be hammered into sheets, alkalai metals, elements in group 1, extremely reactive, alkaline earth metals, elements in group 2 of the periodic table, transition elements, elements in groups 3-12 on the periodic table, nonmetal, elements that have no metallic properties, halogen, elements in group 17 on the periodic table; very reactive, noble gases, elements in group 18; only react under special circumstances; very stable, semiconductors, conduct electricity at high temperatures but not at low temperatures.

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