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