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Noah Vega
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 | 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) | One twelfth 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 in 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. |