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Chapter 5 Vocabulary

Periodic table An arrangement of elements in columns, based on a set of properties that repeat from row to row
Period Each row on the periodic table.
Group Each column on the periodic table.
Periodic Law A pattern of repeating properties.
Atomic Mass Unit (AMU) One twelfth the mass of a carbon-12 atom.
Metals Elements that are good conductors of heat and electricity.
Transition metals Elements that form a bridge between the elements on the left and right side of the periodic table.
Nonmetals Elements that are poor conductors of heat and electric current.
Metalloids Elements with properties that fall between those of metals and nonmetals.
Valence electron An electron that is in the highest occupies energy level of an atom.
Alkali metals The elements in group 1A. These metals have a single valence electron and are extremely reactive.
Alkaline earth metals The elements in group 2A. All alkaline earth metals have two valence electrons.
Halogens The elements in group 7A. Each halogen has seven valence electrons.
Noble gases The elements in group 8A. Most noble gases have 8 valence electrons. They're colorless and odorless and extremely nonreactive.
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