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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 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 | jelements in groups 3 though 12 of the periodic table occur in nature as cuncombined 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 |