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PS Ch. 19
Vocab
Term | Definition |
---|---|
Metal | Element that typically is a hard, shiny solid, is a 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 non metals (insulators) and having controllable conductivity parameters. |
Transuranium Element | Elements having more than 92 protons, all of which are synthetic and unstable. |