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Chem CH3

Chemistry CH3 Introduction to the Periodic Table

TermDefinition
actinide any of the second series of inner transition elements with atomic numbers from 90 to 103; all are radioactive
group the elements in a vertical column of the periodic table
lanthanide one of the first series of inner transition elements with atomic numbers 58 to 71
metal an element that has luster, conducts heat and electricity, and usually bends without breaking
metalloid an element with some physical and chemical properties of metals and other properties of nonmetals
noble gas an element from group 18 that has a full complement of valence electrons and as such is unreactive
nonmetal an element that in general does not conduct electricity, is a poor conductor of heat, and is brittle when solid; many are gases at room temperature
period horizontal row in the periodic table
periodicity the tendency to recur at regular intervals
periodic law the statement that the physical and chemical properties of the elements repeat in a regular pattern when they are arranged in order of increasing atomic number
semiconductor an element that does not conduct electricity as well as a metal, but that does conduct slightly better than a nonmetal
transition element any of the elements in groups 3 through 12 of the periodic table, all of which are metals