Element Crossword

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Across
  1. 2. Number of periods on the periodic table
  2. 7. J.J. Thomson discovered this
  3. 10. Group eleven
  4. 12. The element with 6 protons
Down
  1. 1. Atom with different number of electrons
  2. 3. Number of groups on the periodic table
  3. 4. The atomic mass of Beryllium
  4. 5. Which period of the periodic table corresponds with Calcium (Ca)
  5. 6. The elements that touch the zigzag line (staircase) of the periodic table
  6. 8. Ni
  7. 9. Ac
  8. 11. As