f-block

Asked by  | 28th Feb, 2008, 12:41: PM

Expert Answer:

why are f-block elements called inner- transition elements?Differentiate between lanthanoids and actinoids? Discuss the trend of ionic size and oxidation states in actinoids? (plz. Answer them, don’t tell me to refer

f-block elements called inner- transition elements as they have n-2 orbital incomplete. electronic configuration is 5f in complete and 7s filled.  There is a steady decrease in the atomic and ionic radii M3+as the atomic number increases. This contraction in size is quite regular which is called actinoid contraction.) Lanthanoids mainly exhibit +3 oxidation state. In addition, they show lower oxidation state of +2 and higher oxidation state of +4. Actinoids also exhibit +3 oxidation state. In addition, they show a wide range of higher oxidation states from +4 to +7. This is due to comparable energies of 5f, 6d and 7s orbitals in actinoids.                                                                   

Answered by  | 20th Dec, 2017, 04:08: PM