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  4. Which of the following ions has the smallest radius?

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Q. Which of the following ions has the smallest radius?

Classification of Elements and Periodicity in Properties

Solution:

$r_n \propto \frac{1}{Z}$
$Ti ^{2+}(22)> \underset{\text{smaller}}{Ni ^{2+}(28)} $
$ Pt ^{2+}(5 d $-series )
$ Zr ^{2+}(4 d$ -series )
Have higher number of orbits
Hence, larger size