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| The tendency to recur at regular intervals. |
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| An element that does not conduct electricity as well as a metal, but that does conduct slightly better than a nonmetal. |
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| 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. |
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| A horizontal row in the periodic table. |
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| The elements in a vertical column of the periodic table. |
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| An element from Group 18 that has a full compliment of valence electrons and as such is unreactive. |
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| An element that has luster, conducts heat and electricity, and usually bends without breaking. |
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| Any of the elements in Groups 3-12 of the periodic table, all of which are metals. |
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Definition
| One of the first series of inner transition elements with atomic numbers 58 to 71. |
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| Any of the second series of inner transition elements with atomic numbers from 90 to 103; all are radioactive. |
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Definition
| 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. |
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