Chemistry Crossword Puzzle

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Across
  1. 3. most dense element
  2. 5. charge of an atom when there are less electrons than protons
  3. 7. element without a family
  4. 10. positively charged subatomic particles
  5. 11. where elections can be found
  6. 13. elements in group 18
  7. 15. most abundant natural element on earth
  8. 16. greatest chemist of all time
  9. 17. Atom with a positive or negative charge
  10. 18. family found in group 18
  11. 20. family found in d-block
Down
  1. 1. charge of an atom when there are more electrons than protons
  2. 2. vertical columns on the periodic table
  3. 4. who organized the periodic table
  4. 6. electrons in the outermost energy level of an atom
  5. 8. rarest naturally occurring element in earth's crust
  6. 9. major contributor to the atomic bomb
  7. 12. charge of an atom when there are the same number of electrons and protons
  8. 14. force of attraction or repulsion by charged particles
  9. 19. Group 1 of the periodic table