The Periodic Table

12345678910
Across
  1. 3. AU
  2. 5. group 4
  3. 7. Valence electrons 1 period 2
  4. 9. it weighs 16
  5. 10. Fe
Down
  1. 1. group 11 period 5
  2. 2. 78 protons
  3. 4. it weighs 118.71
  4. 6. 10 proton
  5. 8. valence electrons 1