Element Crossword

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Across
  1. 1. Believed empty space did not exist
  2. 4. Br
  3. 6. Number of groups on the periodic table
  4. 9. Ar
  5. 10. Atomic mass of eleven
  6. 11. Rutherford and the gold foil experiment discovered this
  7. 12. Which period of the periodic table corresponds with Calcium (Ca)
  8. 13. Number of periods on the periodic table
Down
  1. 2. The element with 8 protons
  2. 3. Group eleven
  3. 5. The elements that touch the zigzag line (staircase) of the periodic table
  4. 7. Ne
  5. 8. Atom with different number of electrons