Tomahawk 8th Nature of Matter Ch 4 vocabulary
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Created by:
DawnWiseman on November 16, 2011
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16 terms
Terms | Definitions |
|---|---|
 period | a horizontal row of elements in the periodic table |
| group | contains elements that have similar physical or chemical properties |
| representative elements | include metals, metalloids, and nonmetals |
| transition elements | Elements in the middle of the periodic table, in groups 3-12 |
| metals | element that has luster, is a good conductor of heat and electricity, is malleable, and is ductile |
| nonmetals | usually gases or brittle solids at room temperature and poor conductors of heat and electricity; there are only 17 nonmetals |
| metalloids | elements between metals and nonmetals on the periodic table; element that shares some properties with metals and some with nonmetals. These elements also are called semimetals. |
| alkali metal | one of the elements of group 1 of the periodic table; silvery solids with low densities and low melting points |
| alkaline earth metals | elements in group 2 of the periodic table; denser and harder and have a higher melting point than the alkali metal in the same period; are less reactive than the alkali metals, |
| semiconductor | an element that can conduct electricity under some conditions |
| halogens | one of the elements of Group 17 of the periodic table (fluorine, chlorine, bromine, iodine, and astatine); means salt former |
| noble gas | elements of Group 18: rarely combine with other elements and are found only as uncombined elements: reactivity is very low: |
| catalyst | substance that can make something happen faster but is not changed itself |
| actinide | any of a series of radioactive elements with atomic numbers 89 through 103 |
| lanthanide | any of a series of elements with atomic numbers 57 through 71: also called rare earth metals |
| synthetic element | element that is man-made |
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