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  4. The ionic radius of Na + ions is 1.02 mathringA. The ionic radii (in mathringA ) of Mg 2+ and Al 3+, respectively, are-

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Q. The ionic radius of $Na ^{+}$ ions is $1.02\, \mathring{A}$. The ionic radii (in $\mathring{A}$ ) of $Mg ^{2+}$ and $Al ^{3+}$, respectively, are-

JEE MainJEE Main 2021Classification of Elements and Periodicity in Properties

Solution:

The ionic radii order is

$Na ^{+}> Mg ^{2+}> Al ^{3+}$