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Chapter 5 Vocabulary
Science
Term | Definition |
---|---|
Periodic Table | An arrangement of elements in columns, based on a set of properties that repeat from row to row. |
Period | A row in the periodic table. |
Group | Each column in the periodic table. |
Periodic Law | A pattern of repeating properties. |
Atomic Mass Unit | Defined as one twelfth the mass of a carbon 12 unit. |
Metals | Elements that are good conductors of electric current and heat. |
Transition Metals | Elements that form a bridge between the elements on the left and the elements on the right side of the 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 occupied energy level of an atom. |
Alkali Metals | Metals that have a single valence electron and are extremely reactive. |
Alkaline Earth Metals | Metals with two valence electrons. |
Halogens | Has seven valence electrons. |
Noble Gases | Has eight valence electrons. |