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Chapter 19 Vocab
Term | Definition |
---|---|
metal | element that typically is a hard, shiny solid, is malleable, & is a good conductor of heat & electricity |
malleable | ability of metals & 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 & explains properties such as ductility & the ability to conduct electricity |
radioactive element | element, such as radium, whose nucleus breaks down & emits particles & energy |
transition element | elements in group 3 through 12 of the periodic table; occur in nature as uncombined elements & include the iron triad & 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 & electricity, & 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 & 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) & nonmetals (insulators) & having controllable conductivity parameters |
transuranium element | elements having more than 92 protons, all of which are synthetic & unstable |