Across
- 3. labeled as e-
- 5. the number of protons are related to what kind of property
- 7. means "uncuttable", smallest particle still considered an element
- 8. how atomic mass units are labeled
- 9. a one or two letter abbreviation for an element
- 10. Mendeleev first ordered the elements based on what
Down
- 1. in a regular, repeated pattern
- 2. atoms with the same number of protons and different number of neutrons
- 4. dense, positive charge in the center of an atom
- 6. metals, nonmetals, and what are color-coded on the periodic