Periodic Table of Elements

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Across
  1. 4. named after a Russian scientist
  2. 6. lightest metalloid
  3. 7. has 21 protons
  4. 12. most recently discovered element
  5. 13. heaviest noble gas
  6. 15. used in toothpaste
  7. 16. the heaviest element on the Periodic Table
  8. 18. is located in period 3, group 14
  9. 19. located in period 6, group 2
  10. 20. has 2 vowels in symbol and is a transition metal
  11. 21. located in period 5, group 3
  12. 23. heaviest metal
  13. 24. can be used to blow up balloons
Down
  1. 1. has an atomic number of 31
  2. 2. has an atomic number of 82
  3. 3. only element that stats with an 'x'
  4. 5. main chemical found in charcoal
  5. 6. has 5 protons
  6. 8. has 22 protons and 26 neutrons
  7. 9. only nonmetal on the left side
  8. 10. has an atomic mass of 7
  9. 11. has 18 protons, 22 neutrons, and 18 electrons
  10. 14. has 19 protons, 20 neutrons, and 19 electrons
  11. 15. this element is named after France
  12. 17. has the symbol Na
  13. 22. hottest element on the Periodic Table