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Which of the following pairs has the same size?

  • Option 1)

    Fe^{2+}Ni^{2+}

  • Option 2)

    Zr^{4+}Ti^{4+}

  • Option 3)

    Zr^{4+}Hf^{4+}

  • Option 4)

    Zn^{2+}Hf^{4+}

 

Answers (1)

best_answer

As learnt in

Lanthanoid contraction -

The filling of if orbits before 5d orbits result regular decrease in atomic radii called Lanthanoid contraction or can say the size of radii not much increase.

- wherein

e.g.\:\:\:\:3d\rightarrow 4d\rightarrow 5d

 

 

 The atomic and ionic radii of second and third transition series elements are almost same because lanthanoid contraction does not let the size increase much on moving down the group.

Zr4+, He4+ belong to the second and third period transition series respectively.


Option 1)

Fe^{2+}Ni^{2+}

This option is incorrect

Option 2)

Zr^{4+}Ti^{4+}

This option is incorrect

Option 3)

Zr^{4+}Hf^{4+}

This option is correct

Option 4)

Zn^{2+}Hf^{4+}

This option is incorrect

Posted by

Plabita

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