periodic table

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