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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 is not shiny
element, such as radium, whose nucleus breaks down and emits particles and energy
materials having conductivity properties between that of metals and nonmetals and having controllable conductivity parameters
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