chemistry

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Across
  1. 1. Positively charged ions
  2. 4. modern name for stannum or stannic
  3. 7. Negatively charged radicals
  4. 8. The anion OH stands for
  5. 10. element with atomic number 12
  6. 13. Who discovered the nucleus
  7. 14. particles with no charge in an atom
  8. 15. element with symbol Pb
Down
  1. 2. number of protons in the nucleus
  2. 3. Element used in making slime
  3. 5. The central part of an atom
  4. 6. metal which exists as a liquid on room temperature
  5. 9. electric charge on a proton
  6. 11. Highly reactive and soft metal which imparts yellow color when subjected to flame and is kept in kerosene
  7. 12. Metal which is an important constituent of steel and forms rust when exposed to moist air