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