Crossword

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Across
  1. 4. Noble gas used in advertising signs
  2. 5. contraction Cause of similar atomic radii of zirconium and hafnium
  3. 6. The lightest metal in the periodic table
  4. 7. The element used as the standard for atomic mass calculations
  5. 9. Highly reactive alkali metal stored under kerosene
  6. 11. Which element has the highest electrical conductivity
  7. 14. Element with the highest ionization enthalpy
  8. 15. The only liquid metal at room temperature
  9. 17. Metal extracted from bauxite ore
  10. 19. mass Arrangement of elements in Mendeleev’s periodic table was based on
Down
  1. 1. Naturally radioactive noble gas
  2. 2. Element showing anomalous electronic configuration 3d⁵4s¹
  3. 3. Least electronegative element
  4. 4. Scientist who proposed the Law of Octaves
  5. 8. The only liquid non-metal at room temperature
  6. 10. Element with the highest electron affinity
  7. 12. Most abundant element in the Earth’s crust
  8. 13. Element with atomic number 45
  9. 16. Element essential for chlorophyll formation in plants
  10. 18. Name one metalloid other than silicon and germanium