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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 in a table of elements |
| group | Each column on a periodic table |
| Periodic Law | The pattern of repeating properties |
| atomic mass unit | The value that depends on the distribution of isotopes |
| metals | Good conductors of electric current and heat |
| transition metals | Elements that form a bridge between the elements on the left and right sides of the table |
| nonmetals | Elements that are poor conductors of heat and electrical current |
| metalloids | Elements with properties that fall between the two categories. |
| valence electrons | An electron that is in the highest occupied energy group of an atom. |
| alkali metals | Elements in group 1A |
| alkaline earth metals | Elements in group 2A |
| halogens | elements in group 7A |
| noble gases | Elements in group 8A |