Laken's Project 5/9

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Across
  1. 3. related to the number of energy shells
  2. 5. name of particles in outermost shell
  3. 7. element type made by humans
  4. 10. element with an atomic number of 2
  5. 11. first in group 14
  6. 13. properties of metals and nonmetals
  7. 15. located in middle of periodic table
  8. 18. only bromine and mercury are this at room temperature
Down
  1. 1. particle with a neutral charge
  2. 2. noble gas in group 4
  3. 3. element with the symbol K
  4. 4. particle with a positive charge
  5. 6. has an atomic mass of 47.867
  6. 8. particle with a negative charge
  7. 9. name of first group
  8. 12. most reactive element in group 1
  9. 13. located on the left side of the periodic table
  10. 14. related to the number of valence electrons
  11. 16. element with displaced neutrons
  12. 17. located mostly on right side of the periodic table