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ch.19 ph science
physical science
| Question | Answer |
|---|---|
| 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 groups 3 through 12 of the periodic table; occur in nature as uncombined 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 without 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 element | elements having more than 92 protons, all of which are synthetic and unstable. |