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Randalynn
Chapter 5 Vocabulary
Term | Definition |
---|---|
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. |