chemistry

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