Across
- 2. are Element with different atomic masses
- 5. said 2000 years ago that atom cant be divided
- 7. number is Atomic mass - neutrons
- 9. responsible for chemical bonding
- 12. states that there are places around the nucleus , where the probability of finding electrons increased
- 13. states that atoms combine to form compounds
Down
- 1. plays an important role in identifying isotopes
- 3. carry a positive charge
- 4. said to be neutral
- 6. states that atom is almost an empty space with a solid center
- 8. , resulted when an atom loses or gains electrons
- 10. discovered Electrons
- 11. where most of atom mass concentrated