Periodic table

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Across
  1. 2. chemical symbol Li
  2. 4. when two or more substances are chemically bonded
  3. 7. ____ metals. Most reactive group in the periodic table
  4. 9. group 8 in the periodic table
  5. 10. chemical symbol He
  6. 12. columns
  7. 13. made the modern periodic table
Down
  1. 1. Used in nuclear power plants
  2. 3. group 7 in the periodic table
  3. 5. rows
  4. 6. chemical symbol C
  5. 7. ____ earth metals group 2
  6. 8. how many oxygen atoms does Carbon Dioxide contain
  7. 10. atomic number 1
  8. 11. A substance that is made of two or more substances not chemically bonded