Periodic Table

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Across
  1. 1. An ____ is the smallest unit of an element
  2. 4. Pure substances made up of 2 or more pure atoms
  3. 6. _____ are made up of atoms bonded together
  4. 9. Na
Down
  1. 1. Silver
  2. 2. Mg
  3. 3. The chemical formula for water
  4. 5. He
  5. 7. Calcium
  6. 8. pure substance made up of only one atom