I'm Crazy about Chemistry

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Across
  1. 1. location of protons and neutrons
  2. 5. cloud spherical area of electrons
  3. 6. weight average of atomic masses
  4. 8. unstable isotopes
  5. 10. no (very little) mass and negative
  6. 11. amount of material in matter
  7. 12. atoms held by shared electrons
  8. 13. shell outermost energy level of atom
  9. 16. takes up space & has mass
  10. 17. different # of neutrons than protons
Down
  1. 2. particles what atoms are made of
  2. 3. has mass & no electrical charge
  3. 4. has mass & positive electrical charge
  4. 7. atoms of 2 different elements in fixed proportion
  5. 9. bonds formed between atoms
  6. 14. smallest stable units of matter
  7. 15. atoms with same atomic number