History of the Periodic Table

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Across
  1. 3. one of the elements Mendeleev predicted the properties of
  2. 4. refers to trends or recurring variations in element properties with increasing atomic number
  3. 5. law of octaves
  4. 8. first periodic law arranged elements according to this
  5. 9. left spaces for elements not yet discovered
Down
  1. 1. discovered the noble gases
  2. 2. law of triads
  3. 6. modern periodic law arranges elements according to this
  4. 7. discovered atomic number