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Term | Definition |
---|---|
Periodic table | A chart that organizes information 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 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 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 |