Periodic table

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Across
  1. 4. smallest particle of an element
  2. 8. the number of protons in an atom
  3. 9. nonmetal in group 17 of the periodic table that has seven valence electrons
  4. 11. si unit for the mass of an atom
  5. 14. elements that have properties of both metals and nonmetal
  6. 15. a table organizing all of the elements known exist
Down
  1. 1. a particle that is inside of the nucleus and has a positive charge
  2. 2. a particle outside the nucleus that has a negative charge
  3. 3. column of the periodic table that contains elements with similar properties
  4. 5. class of elements that are good conductors of electricity
  5. 6. the center of an atom
  6. 7. nonmetal in group 18 of the periodic table that has eighth valence electrons
  7. 10. located in the nucleus and has a neutral charge
  8. 12. class of element that do not conduct electricity
  9. 13. row of the periodic table that contains elements ranging from metals on the left to Metalloid and then nonmetals on the right