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