Periodic Table Crossword Puzzle

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Across
  1. 2. I am the first element in group 11 and am the coat of a penny.
  2. 6. Belongs to the alkaline earth metals family and has an atomic number of 12.
  3. 8. I am an element in period one, found on the left side of the periodic table.
  4. 10. Has a chemical symbol of Po.
  5. 13. I have 20 protons.
  6. 16. Has an atomic number of 78.
  7. 18. This transition metal has 28 neutrons.
  8. 19. I have an atomic mass of 32.
  9. 22. I have 53 electrons.
  10. 23. I have a chemical symbol of Ne.
Down
  1. 1. I have 22 neutrons.
  2. 3. This non-metal has eight neutrons.
  3. 4. I am found in period two and belong to group one.
  4. 5. I have a chemical symbol of Xe.
  5. 7. A strong, silvery-grey transition metal, found in group eight.
  6. 9. This alkali metal has 12 neutrons.
  7. 11. I have 88 electrons.
  8. 12. Has a chemical symbol of Sn.
  9. 14. An expensive yellow transition metal, that has an atomic number of 79.
  10. 15. I am at the top of the fourth group and belong to period four.
  11. 17. Has a chemical symbol Ba.
  12. 18. Is the second lightest metal of the halogens family and is a chemical element.
  13. 20. Has an atomic number of 30.
  14. 21. Has a total of 125 neutrons.