In context of the lanthanoids, which of the following statement is not correct ?

  • Option 1)

    There is a gradual decrease in the radii of the members with increasing atomic number in the series.

  • Option 2)

    All the members exhibit +3 oxidation state

  • Option 3)

    Because  of similar properties the separation of lanthanoids is not easy.

  • Option 4)

    Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series.

 

Answers (1)

As we learnt in

Electronic configuration -

The lanthanoid follow the  4f1-14  5d0-1  6s2  configuration (common configuration)with some exception due to full filled half filled electronic configuration.

 

- wherein

eg\rightarrow 4f^{1}5d^{1}6s^{2}

 

4f electrons of lanthanoids did not participate in bond formation.

 


Option 1)

There is a gradual decrease in the radii of the members with increasing atomic number in the series.

This option is incorrect.

Option 2)

All the members exhibit +3 oxidation state

This option is incorrect.

Option 3)

Because  of similar properties the separation of lanthanoids is not easy.

This option is incorrect.

Option 4)

Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series.

This option is correct.

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