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Periodic Table
Chapter 10
Term | Definition |
---|---|
group | a column on the periodic table |
period | a row on the periodic table |
periodic table | a chart of the elements arranged into rows and columns according to their physical and chemical properties |
periodic | occur with repeating pattern |
alkali metal | element in group 1 on the periodic table; very reactive with other elements; lowest density of metals; react violently with water |
alkaline earth metal | element in group 2 on the periodic table; soft and silvery |
ductile | ability of a substance to be pulled into thin wires |
luster | ability of a metal to reflect light |
malleability | ability of a substance to be hammered or rolled into sheets |
metal | element that is shiny; good conductor of electricity and thermal energy; easily pulled into wires or hammered into thin sheets |
transition metal | elements in groups 3-12 on the periodic table; all metals with high densities and less reaction with oxygen |
halogen | element in group 17 on the periodic table |
metalloid | element with physical and chemical properties of both metals and nonmetals |
noble gas | element in group 18 on the periodic table; do not form compounds naturally |
nonmetal | has no metallic properties; do not conduct thermal energy or electricity, many are gases |
semiconductor | material that conducts electricity at high temperatures but not at low temperatures |