The periodic table

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Across
  1. 4. beryllium
  2. 6. oxygen
  3. 8. nitrogen
  4. 9. hydrogen
  5. 10. neon
  6. 11. lithium
Down
  1. 1. carbon
  2. 2. fluorine
  3. 3. magnesium
  4. 4. boron
  5. 5. sodium
  6. 7. helium