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Chapter 5 Vocab
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 a periodic table of elements. |
Group | A column of elements in a periodic table. |
Periodic Law | The pattern of repeating properties displayed by elements in the periodic table. |
Atomic Mass Unit (AMU) | 1/12 the mass of a carbon-12 atom |
Metals | Elements that are good conductors of heat and electric current. |
Transition Metals | Elements that form a bridge between elements on the left and right sides 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 the highest occupied energy level of an atom. |
Alkali Metals | The elements in group 1A of the periodic table, not including hydrogen. |
Alkaline Earth Metals | The elements in group 2A of the periodic table. |
Halogens | The elements in group 7A of the periodic table. |
Noble Gases | The elements in group 8A of the periodic table. |