14 terms

The Periodic Table

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Period
horizontal rows of elements whose properties change gradually and predictably
Group
family of elements that have similar physical or chemical properties
Transition Elements
elements in groups 3-12, all are metals
Metal
element that is malleable, ductile, a good conductor of electricity with a shiny, metallic luster
Nonmetal
element that is usually a gas or brittle solid and is a poor conductor of heat and electricity
Metalloid
element that shares some properties with both metals and nonmetals
Alkali Metals
elements in group 1, with 1 valence electron
Alkaline Earth Metals
elements in group 2, with 2 valence electrons
Halogens
elements in group 17, with 7 valence electrons
Noble Gases
elements in group 18, with 8 valence electrons
Valence electrons
electrons in the outer shell
Malleable
ponded or pressed into thin sheets or shaped into ibjects
Ductile
drawn out into wires
Luster
ability to reflect light