Science Vocab Crossword Puzzle

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Across
  1. 3. horizontal row of elements
  2. 5. atoms have different electronegativity
  3. 7. number of protons in the element
  4. 9. outermost electrons
  5. 11. Group 18 on the periodic table
  6. 14. vertical column of elements
  7. 15. when 2 atoms share valence electrons
Down
  1. 1. atoms have the same electronegativity
  2. 2. pure substance made of atoms
  3. 4. a - charged ion
  4. 6. subatomic particle with a + charge
  5. 8. subatomic particle with no charge
  6. 10. subatomic particle with a - charge
  7. 12. Different number of protons & electrons
  8. 13. a + charged ion