Across
- 4. building blocks of ordinary matter
- 5. inside the nucleus
- 6. has no electrical charge
- 8. located outside the nucleus
- 9. surrounds the nucleus
- 10. table all diffrent types of matter on earth
Down
- 1. the middle of the atom
- 2. protons plus neutron
- 3. mass number of 1 on the periodic table
- 7. mass number of 7 on the periotic table