Periodic Table

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Across
  1. 4. element symbol of copper
  2. 5. first element in group one
  3. 6. fattest element
  4. 10. 8 protons and 7 neutrons
  5. 12. element name for Au
  6. 13. first element on the periodic table
  7. 16. first element of group 7
  8. 17. element name for Na
  9. 18. noble gas with the atomic number of 10
  10. 20. largest atomic number of all elements
Down
  1. 1. element name of Xe
  2. 2. element with the atomic number of 16
  3. 3. forth noble gas on the periodic table
  4. 7. what element has the average atomic mass of 39.95
  5. 8. what element has the average atomic mass of 40.08
  6. 9. what is the 4th element
  7. 11. element symbol for Fe
  8. 14. what type of metal is aluminum
  9. 15. same number of protons but different number of electrons
  10. 19. which elements have the atomic number of 2