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element that typically is a hard, shiny solid, is malleable, and is a good conductor of heat and electricity
occurs because electrons move freely among a metal's positively charged ions and explains properties such as ductility and the ability to conduct electricity
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 not shiny
element, such as radium, whose nucleus breaks down and emits particles and energy
materials having conductivity properties between that of metals (good conductors) and nonmetals (insulators) and having contollable conductivity parameters
elements in Group 3 through 12 of the periodic table; occur in nature as uncombined elements and include the iron triad and coinage metals
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