Across
- 2. same _____, same number of valence electrons
- 6. has a neutral/no charge
- 7. the space around the nucleus where electrons orbit
- 10. same group, same _________
- 12. horizontal rows on the periodic table
- 13. valence electrons determine an atom's ______
- 14. vertical columns on the periodic table
Down
- 1. the electrons on the outermost energy level of an atom
- 3. protons determine an atom's ______
- 4. atomic mass = atomic#/protons + neutrons
- 5. has a positive charge
- 8. a pure substance whose atoms are all the same
- 9. atomic# = #ofprotons = #ofelectrons
- 11. has a negative charge