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reconize that there are more than 100 elements and some have similar properties
| Term | Definition |
|---|---|
| periodic table | a table that shows elements in a way that describes something that occurs or repeats at irregular intervals |
| 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 that share chemical properties |
| valence electrons | electron that is found in the outermost shell of an atom and that determines the atom's chemical properties. |
| reactivity | the state or power of being reactive |
| metalloid | elements that have properties of metals and nonmetals |
| inert | lacking ability or strength to move |