Asked by | 28th Feb, 2008, 12:41: PM
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
- Why lanthanide show high oxidation state than actinide
- Why do Zr and Hf occur together in nature?
- Write down the most common oxidation state for lanthanoids.
- Write down the number of electrons in 4f, 5d and 6s orbital of Ce in +4 oxidation state.
- Write down the outer electronic configuration of Uranium.
- Why Ce4+ behaves as good oxidising agent although being a stable species?
- What is mischmetall and what is its use?
- Why it is very difficult to study the chemistry of Actinoid?
- Write the electronic configuration of the following elements of lanthanoid and their possible oxidation state other than +3: (a) Eu and (b) Yb.
- Give a note on the chemical reaction of lanthanoids.
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