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How would you account for the following ...

How would you account for the following ?
Lanthanoids form primarily + 3 ions, while the actinoids usually have higher oxidation states in their compounds, + 4 or even + 6 being typical.

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Lanthnoids show limited number of oxidation states (+2, +3 and +4 of which + 3 in the most common). This is because 4f - orbitals in lanthanoids are buried deep inside the atom, totally shielded by outer orbitals and thus unable to take part in bonding. On the otherhand, actionoids show a large number of oxidation states, including the higher ones, because 5f - orbitals extend in space beyond 6s and 6p - orbitals and thus participates favourably in bonding.
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CHHAYA PUBLICATION-D - AND F - BLOCK ELEMENTS -SOLVED CBSE SCANNER
  1. How would you account for the following ? Many of the transition ele...

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  2. How would you account for the following ? The metallic radii of the...

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  3. How would you account for the following ? Lanthanoids form primaril...

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  4. Complete the following equations : Cr(2)O(7)^(2-)+2OH^(-)to

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  5. Complete the following equations : MnO(4)^(-)+4H^(+)+3e rarr

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  6. Account for the following : Zn is not considered as a transition el...

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  7. Account for the following : Transition metals form a large number o...

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  8. Account for the following : The E^(0) value for the Mn^(3+)|Mn^(2+)...

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  9. With reference to structural variability and chemical reactivity, writ...

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  10. Name a member of the lanthanoid series which is well known to exhibit ...

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  11. Complete the following equation : MnO(4)^(-)+8H^(+)+5e to

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  12. Out of Mn^(3+) & Cr^(3+), which is more paramagnetic and why ? (Atomi...

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  13. Suggest reasons for the following features of transition metal chemist...

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  14. What is lanthanoid contraction ? What are consequeces of lanthanoid co...

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  15. Describe the preparation of potassium permanganate. How does the acidi...

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  16. Describing the oxidising action of potassium dichromate and write the ...

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  17. When chromite ore FeCr(2)O(4) is fused with NaOH in presence of air, a...

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  18. When chromite ore FeCr(2)O(4) is fused with NaOH in presence of air, a...

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  19. Complete the following chemical equations : 8MnO(4)^(-)+3S(2)O(3)^(...

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  20. Complete the following chemical equations : Cr(2)O(7)^(2-)+3Sn^(2+)...

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