science voc chap 19
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cecco1 on April 26, 2011
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14 terms
Terms | Definitions |
|---|---|
 allotrope | different forms of the same element having different molecular structures |
| diatomic molecule | a molecule that consists of two atoms of the same element |
| ductile | ability of metals to be drawn into wires |
| malleable | ability of metals and alloys to be rolled or hamered into thin sheets |
| metal | element that typically is a hard, shiny solid, is malleable, and is a good conductor of heat and electricity |
| metallic bonding | occurs because electrons move freely among a metal's positively charged ions and explains properties such as ductility and the ability to conduct electricity |
| metalloid | an element that has some characteristics of metals and some characteristics of nonmetals |
| nonmetal | element that usually is a gas or brittle solid at room temperature, is not malleable or ductile, is a poor conductor of heat and electricity, and typically is not shiny |
| radioactive element | element, such as radium, whose nucleus breaks down and emits particles and energy |
| salt | compound formed when negative ions from an acid combine with positive ions from a base |
| semiconductor | materials having conductivity properties between that of metals and nonmetals and having controllable conductivity parameters |
| sublimation | the process of a solid changing directly to a vapor without forming a liquid |
| transition element | elements in Group 3-12 |
| transuranium element | elements having more than 92 protons, all of which are synthetic and unstable |
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