Atoms & Periodic Table

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Across
  1. 4. The smallest unit of an element...
  2. 6. The number of protons in the nucleus...
  3. 7. Region of an atom surrounding the nucleus
  4. 9. Elements that have some properties of ...
  5. 12. Weighted average of the masses...
  6. 13. Elements that are shiny and conduct heat...
  7. 14. Subatomic particles that have a positive charge
  8. 16. An arrangement of the elements in order..
  9. 17. Abbreviation for an element's name
  10. 18. Total number of protons+neutrons in an atom
Down
  1. 1. Subatomic particles that have no charge
  2. 2. Electrons in the outermost portion...
  3. 3. Elements that are poor conductors of heat...
  4. 5. Vertical column of elements in the period table...
  5. 8. Small dense center of the atom...
  6. 10. An atom of an element with a different number...
  7. 11. Horizontal rows of elements with predictable...
  8. 15. Negatively-charged subatomic particles