Across
- 1. sharing a pair of valence electrons
- 7. starting molecules of a chemical reaciton
- 8. number of protons in the nucleus
- 12. atoms are not shared equally
- 14. negatively charged ion
- 15. sharing two pairs of electrons
- 16. neutral charge
- 19. positive charge
- 20. atoms with net electric charge
Down
- 2. outermost electrons
- 3. attraction between a cation and an anion
- 4. final molecules of a chemical reaction
- 5. atom's total mass
- 6. sum of protons and neutrons
- 9. same # of atoms & elements, different structure
- 10. outermost shell
- 11. smallest unit of matter
- 13. negative charge
- 17. positively charged ion
- 18. sharing one pair of electrons