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allotrope

different forms of the same element having different molecular structures

diatomic molecule

a molecule that consists of two atoms of the same element

ductile

ability of metals to be drawn into wires

malleable

ability of metals and alloys to be rolled or hamered into thin sheets

metal

element that typically is a hard, shiny solid, is malleable, and is a good conductor of heat and electricity

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

metalloid

an element that has some characteristics of metals and some characteristics of nonmetals

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

radioactive element

element, such as radium, whose nucleus breaks down and emits particles and energy

salt

compound formed when negative ions from an acid combine with positive ions from a base

semiconductor

materials having conductivity properties between that of metals and nonmetals and having controllable conductivity parameters

sublimation

the process of a solid changing directly to a vapor without forming a liquid

transition element

elements in Group 3-12

transuranium element

elements having more than 92 protons, all of which are synthetic and unstable

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