Atoms and the periodic table

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Across
  1. 1. The scientific name for columns in the periodic table
  2. 4. The number of electrons in chlorine's OUTER shell
  3. 5. The positively charged particle in an atom
  4. 7. Another name for group seven elements
  5. 9. Formed when an element gains an electron
  6. 12. The scientist who's periodic table we still use
  7. 13. Where we find electrons in an atom
Down
  1. 2. The element with the relative atomic mass of 16
  2. 3. The scientific name for rows in the periodic table
  3. 5. What we make when we remove an electron from an element
  4. 6. The element which contains 6 protons and 6 neutrons
  5. 8. The number of electrons allowed in the first shell
  6. 10. The name for the group of protons and neutrons
  7. 11. The element with the chemical symbol Hg
  8. 14. The element with the chemical symbol Pb