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Chapter 19 Vocab.
Term | Definition |
---|---|
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 or alloys to be pulled into wires. |
Metallic Bonding | occurs because electrons move freely among a metal's positively charged ions and explains properties such as ductility 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 and nonmetals and having controllable conductivity parameters. |
Transuranium element | elements having more than 92 protons, all of which are synthetic and unstable. |