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Chemistry; Ch. 3

Crystal Cathedral High School Sophomores (Semester 1; Ms. Rose)

Group The elements in a vertical column of the periodic table.
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.
Nonmetal An element that is in general does not conduct electricity, is a poor conductor of heat, and is brittle when solid. Many are gases at room temperature.
Period A horizontal row in the periodic table.
Periodicity The tendency to recur at regular intervals.
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.
Actinides Inner transition metals; radioactive- none beyond Uranium occur in nature.
Halogens Group 17; active nonmetals- never exist alone in nature, tend to gain one more electron (-1 charge)
Inner Transition Metals Lanthanides and actinides; complex and ever changing atomic structure, changing oxidation states.
Lanthanides "Rare earth metals"; rarely found on earth.
Metalloids Can be semi-conductors; have properties of metals and nonmetals.
Metals Strong; durable; abundant; lustrous; high melting point (MP).
Noble Gasses Group 18; inert, have a full octet of electrons.
Nonmetals Abundant in nature; bad conductors of electricity; gas at room temperature.
Created by: dez(a)rey