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 or alloys to be pulled into wires
Malleable
ability of metals and alloys to be rolled or hammered 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
element that shares some properties with metals and some with 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 groups 3 through 12 of the periodic table; occur in nature as uncombined elements and include the iron triad and coinage metals
Transuranium Element
element having more than 92 protons, all of which are synthetic and unstable.