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Across
  1. 4. Russian chemist who organized the first widely recognized periodic table
  2. 9. Row of radioactive elements below the main table
  3. 10. Modern periodic table is organized by this
  4. 11. Rare earth metals usually shown in a separate row below the main table
  5. 12. Shell – Outermost region of an atom, important for chemical properties
Down
  1. 1. Element 118, the heaviest confirmed element on the periodic table
  2. 2. arranged elements in order of this
  3. 3. The rows of the periodic table
  4. 5. Group 18 elements that are inert due to full outer electron shells
  5. 6. Metals – Elements in the center of the periodic table, often used in industry
  6. 7. Organization that updates and confirms elements on the periodic table
  7. 8. The repeating pattern of chemical properties that Mendeleev observed