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chapter 19
| Term | Definition |
|---|---|
| metal | element that typically is a hard, shiny solid, is malleable, & is a good conductor of heat & electricity |
| malleable | ability of metals & alloys to be rolled or hammered into thin sheets |
| ductile | ability of metals to be drawn into wires |
| metallic bonding | occurs because electrons move freely among a metals positively charged ions & explains properties such as ductility & the ability to conduct electricity |
| radioactive element | elements, such as radium, whose nucleus breaks down & emits particles & energy |
| transition element | elements in group 3 through 12 of the periodic table; occur in nature as uncombined elements & include the iron triad & coinage metals |
| non metal | elements that usually is a gas or brittle solid at room temperature, is not malleable or ductile is a poor conductor of heat & electricity, & typically is not shiny |
| diatomic molecule | a molecule that consists of two atoms of the same elements |
| salt | compound formed when negative ions from an acid combine with positive ions from a base |
| sublimation | the process of a solid changing directly to a vapor without forming a liquid |
| metalloid | element that shares some properties with metals & some with nonmetals |
| allotrope | different forms of the same elements having different molecular structures |
| semiconductor | materials having conductive properties between that of metals ( good conductors ) & nonmetals ( insulators ) & having controllable conductivity parameters |
| transuranium element | elements having more than 92 protons, all of which are synthetic & unstable |
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