Arrange Ce^{3+}, La^{3+}, Pm^{3+}  and Yb^{3+} in increasing order of their ionic radii.

  • Option 1)

    Yb^{3+}<Pm^{3+}<Ce^{3+}<La^{3+}

  • Option 2)

    Ce^{3+}<Yb^{3+}<Pm^{3+}<La^{3+}

  • Option 3)

    Yb^{3+}<Pm^{3+}<La^{3+}<Ce^{3+}

  • Option 4)

    Pm^{3+}<La^{3+}<Ce^{3+}<Yb^{3+}

 

Answers (1)

As we learnt in

Ionic Radii -

As atomic radii, ionic radii also decrease with increase in atomic number.In +3 oxidation state.

 

-

 

 the increasing order of ionic radii of Ce3+ , La3+ , Pm3+ and Yb3+ is Yb3+<Pm3+<Ce3+<La3+


Option 1)

Yb^{3+}<Pm^{3+}<Ce^{3+}<La^{3+}

This option is correct.

Option 2)

Ce^{3+}<Yb^{3+}<Pm^{3+}<La^{3+}

This option is incorrect.

Option 3)

Yb^{3+}<Pm^{3+}<La^{3+}<Ce^{3+}

This option is incorrect.

Option 4)

Pm^{3+}<La^{3+}<Ce^{3+}<Yb^{3+}

This option is incorrect.

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