Periodic Table Puzzle

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Across
  1. 4. Has 27 protons
  2. 5. The element symbol is Cs
  3. 7. The snack that smiles back ___fish
  4. 8. Chemical symbol is Pb
  5. 12. Chemical symbol is I
  6. 13. Element in group 18, period 4
  7. 16. Atomic number is 10
  8. 17. Atomic number is 78
  9. 18. The only liquid metal
  10. 20. A transition metal in period 5 with 64 neutrons
  11. 22. A transition metal in period 5 with 58 neutrons
  12. 23. Element symbol is He
Down
  1. 1. A member of the Halogens family in period 4
  2. 2. Top element of alkali metals
  3. 3. In the top right corner of transition metals
  4. 6. Nutrient found in bananas
  5. 9. Found in group 15, period 4
  6. 10. A metal in period 6 with 126 neutrons
  7. 11. An element in period 5 with 61 neutrons
  8. 14. The element symbol is Ra
  9. 15. Have 56 electrons
  10. 19. A member of the noble gasses in period 6
  11. 20. Chemical found in pools
  12. 21. The coating of the smallest value coin