Element Crossword

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