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S8P1.f
more than 100 elements that have similar properties
| Term | Definition |
|---|---|
| periodic table | a chart that organizes information about all of the known elements |
| period | in chemistry, a horizontal row of elements in the periodic table |
| group | a vertical column of elements in the periodic table;elements in a group share chemical properties |
| valence elections | an electron that is found in the outermost shell of an atom and that determines the atom's chemical properties |
| reactivity | describes how likely an element is to form bonds with other elements |
| metalloid | elements that have properties of both metals and nonmetals |
| inert | unable to react chemically under normal circumstances |