Chemistry Crossword Puzzle

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Across
  1. 5. compound
  2. 8. number, gas
  3. 9. ionic bond
  4. 10. covalent bond
Down
  1. 1. endothermic
  2. 2. exothermic
  3. 3. table, element
  4. 4. chemistry
  5. 6. solid
  6. 7. electron, Neutron
  7. 9. number, ion