Periodic table of elements

123456789101112
Across
  1. 3. ____ number is amount of protons in nucleus
  2. 5. main component of air
  3. 7. group number 16
  4. 9. vertical in periodic table
  5. 11. some electrodes are made of this metal
  6. 12. used to be a currency
Down
  1. 1. second lightest halogen
  2. 2. steel is an alloy of ____ and carbon
  3. 4. element or planet
  4. 6. element named after a country in central Europe
  5. 8. Xenon and Krypton are ____ gases
  6. 10. horizontal in periodic table