Across
- 2. regions of space outside the nucleus of atom
- 6. Basic unit of a chemical element
- 7. negative charge
- 8. developed periodic table
- 9. atomic weight
- 10. politic charge
- 11. no charge
Down
- 1. number of protons in the nucleus of atom
- 3. on periodic table
- 4. center of the atom built of protons and neutrons
- 5. electrons on outermost orbital