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Chemistry; Ch. 3
Crystal Cathedral High School Sophomores (Semester 1; Ms. Rose)
Question | Answer |
---|---|
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. |