periodic table

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Across
  1. 4. its not a metal.
  2. 6. a negatively charged ion
  3. 7. they are all odorless, colorless, monatomic gases with very low chemical reactivity.
Down
  1. 1. horizontal rows on the periodic table
  2. 2. a solid material that is typically hard, shiny, malleable
  3. 3. a positively charged ion
  4. 5. a measurement of large quantities of very small entities