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Why do lanthanides form polymorphic oxides?

Option: 1

Increase in number of unpaired electrons.

 


Option: 2

Smaller size of cation.

 


Option: 3

Larger size of cations.

 


Option: 4

Shielding effect of f-orbitals effect the coordination number.


Answers (1)

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Smaller size of cation ensures different coordination environments, and the oxides can switch easily from one shape to another easily. 

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Ritika Jonwal

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