The Periodic Table

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