Element Crossword

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Across
  1. 3. Which period of the periodic table corresponds with Lithium (Li)
  2. 7. The elements that touch the zigzag line (staircase) of the periodic table
  3. 11. Number of groups on the periodic table corresponds with Halogens
  4. 12. B
Down
  1. 1. Li
  2. 2. Atom with different number of electrons
  3. 4. Group seven
  4. 5. The element with 5 protons
  5. 6. Ag
  6. 8. Number of periods on the periodic table
  7. 9. Atomic mass of Neon
  8. 10. Democriticus coined this word