Periodic Table & Electrons Crossword Puzzle

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Across
  1. 2. the number of protons an atom has is known as its ___ number
  2. 6. a proton has this charge
  3. 8. a nitrogen ion will always have this charge (but negative)
  4. 9. the family in group 17 of the periodic table
  5. 12. compared to an atom, an ion has a different number of these
  6. 14. the term describing outer electrons involved in bonding or reactions
  7. 15. noble gases are nonreactive because their outer valence layer is ____
  8. 16. an ion with a positive charge
Down
  1. 1. the family in group 1 of the periodic table
  2. 3. this element in row 2 has 6 valence electrons
  3. 4. according to Coulomb's Law, a proton & electron will do this
  4. 5. how many valence electrons does magnesium have?
  5. 6. another name for a horizontal row on the periodic table
  6. 7. according to Coulomb's Law, two electrons will do this
  7. 10. a cation is formed by ____ electrons
  8. 11. how many valence electrons does bromine have?
  9. 13. what element is in period 4, group 2?