Science Puzzle

12345678910111213
Across
  1. 2. Mix of 2 or more elements
  2. 4. +1 charge
  3. 5. 0 charge
  4. 6. Contains protons and neutrons
  5. 8. Everything on the periodic table
  6. 10. Elements on the far right side of the periodic table
  7. 11. Most reactive metals
  8. 12. -1 charge
  9. 13. Made up of one element/compound
Down
  1. 1. No obvious differences
  2. 3. Periodic table's "Stair step"
  3. 6. On far right of table but includes Hydrogen
  4. 7. Takes up most of the table
  5. 9. Obvious differences