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14 terms

science voc chap 19

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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