| A | B |
|---|
| metal | element that typically is a hard, shiny solid, is malleable, and is a good conductor of heat and electricity |
| malleable | ability of metals and 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 metal's positively charged ions and explains properties such as ductility and the ability to conduct electricity |
| radioactive element | element, such as radium, whose nucleus breaks down and emits particles and energy |
| transition element | elements in Goups 3 throught 12 of the periodic table; occur in nature as uncombinded elements and include the iron triad and coinage metals |
| 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 |
| diatomic molecule | a molecule that consists of two atoms of the same element |
| 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 with forming a liquid |
| metalloid | element that shares some properties with metals and some with nonmetals |
| allotrope | different forms of the same element having different molecular structures |
| semiconductor | materials having conductivity properties between that of metals (good conductors) and nonmetals (insulators) and having controllable conductivity parameters |
| transuranium | elements having more than 92 protons, all of which are synthetic and unstable |
