Periodic table

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Across
  1. 3. the chemical element with the symbol O
  2. 4. a chemical element with the symbol Ne
  3. 6. a chemical element with the symbol He
  4. 11. the chemical element with the symbol N
  5. 12. a chemical element with the symbol Be
Down
  1. 1. a chemical element with the symbol F
  2. 2. the chemical element with the symbol H
  3. 5. a chemical element with the symbol Li
  4. 7. a column of elements in the periodic table
  5. 8. a chemical element with the symbol C
  6. 9. a row of elements in the periodic table
  7. 10. a chemical element with the symbol B