Chapter 3 vocabulary

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Across
  1. 3. number number of particles in a nucleus
  2. 5. smallest partcle; negative charge
  3. 8. mechanical model nucleus contains protons & neutrons
  4. 10. model electrons travel in circles
  5. 11. pudding model atoms are positive spheres
  6. 14. negatively charged ion
  7. 16. has not electrical charge
Down
  1. 1. positively charged ion
  2. 2. the same atom with different nuetron numbers
  3. 4. mass mass of an atom
  4. 5. level area where electrons are found
  5. 6. model atom has positive nuetron & negative electrons
  6. 7. has a positive charge
  7. 9. number number of protons in atoms
  8. 12. of electostatic charges opposite electrical charges attract
  9. 13. mechanics physics exploring matter & energy
  10. 15. a charged atom