The effect of lanthanoid contraction in the lanthanoid series of element by and large means ?

  • Option 1)

     

    Increase in both atomic and ionic radii.

     

  • Option 2)

     

    Decrease in atomic radii and increase in ionic radii.

     

  • Option 3)

     

    Decrease in both atomic and ionic radii.

  • Option 4)

     

    Increase in atomic radii and decrease in ionic radii.

Answers (1)
A admin

 

Lanthanoides -

The fourteen elements from  Ce - Lu is Lanthanoids but the properties of La is much closer to lanthanoid.

- wherein

eg\rightarrow\:La_{(not\:lanthanoid)}\:Ce....Lu

 

 

Electronic configuration of Lanthanoids -

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}

 

 

Radial node of lanthanoids -

n-l-1

- wherein

eg\rightarrow \:4-3-1=0

 

 

 

Properties of Lanthanoids -

The lanthanoids are silvery white soft metals and tarnish rapidly in air.The hardness increases with increasing atomic number.

- wherein

    Pm is man made radioactive elements.

 

As we have learned in lanthoid contraction due to lathanoid contraction tends to atomic radii and ionic radii decreases gradually in the lanthanoid series.

 


Option 1)

 

Increase in both atomic and ionic radii.

 

Option 2)

 

Decrease in atomic radii and increase in ionic radii.

 

Option 3)

 

Decrease in both atomic and ionic radii.

Option 4)

 

Increase in atomic radii and decrease in ionic radii.

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