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