Chemistry

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Across
  1. 5. A covalent compound
  2. 7. A halogen
  3. 8. positive ion
  4. 11. an alkaline earth metal
  5. 12. the numbers of protons
  6. 13. an actinide
  7. 15. gave modern periodic table
Down
  1. 1. A metalloid
  2. 2. liquid metal
  3. 3. negative ion
  4. 4. first one to define atoms
  5. 6. A negatively charged particle
  6. 9. An ionic compound
  7. 10. A positively charged particle
  8. 14. A transition metal