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Chapter 19 vocab
Metal | Element that typically is hard, shiny gold, 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 positive charged ions and explains properties such as ductility and the ability to conduct electricity. |
Radioactive elements | 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. |
transmutation element | Elements having more than 92 protons, all of which are synthetic and unstable. |