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recongnize that there are more than 100 elements and some have similar propertie
| Term | Definition |
|---|---|
| periodic table | a chart that organizes info. about all of the known 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; elements in a group share chemical properties . |
| valence electron | an electron that is found in the outermost shell of an atom and that determines the atoms chemical properties . |
| reactivity | describes how likely an elements is to form bonds with other elements. |
| metalliod | elements that have properties of both metals and nonmetals |
| inert | unable to react chemically under normal circumstances |