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