1.

Which of the following has same size?

Answer»

`Fe^(2+),NI^(2+)`
`Zr^(4+),Ti^(4+)`
`Zr^(4+),Hf^(4+)`
`Zn^(2+),Hf^(4+)`

Solution :In general, the atomic and ionic radii increases on moving down in a group. But the element of second TRANSITION series (eg.,Zr,Nb,Mo ETC.,) have the ALMOST same radii as the elements of third transition series (eg.Hf,Ta,W etc). This is because of lanthanide contraction.


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