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periodic table
| Question | Answer |
|---|---|
| how were early periodic tables arranged? | by atomic weight |
| which to elements were not ordered by atomic weight? | iodine and lithium |
| what are groups 1, 7, and 0 called? | alkali metals, halogens, noble gasses |
| what are metals? | react to form positive ions |
| what are non metals? | do not form positive ions |