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STD 11 - 3. Classification of elements and periodicity in properties — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3. Classification of elements and periodicity in properties4 Marks
Question
The ionic sizes decreases in the order :-
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Answer

b
$S ^{2-}, K ^{+}, Sc ^{3+}, V ^{5+}$ and $Mn ^{7+}$ have equal no. of electrons. So, they are isoelectronic. For iso-electronic species, size is inversely proportional to the effective nuclear charge. Effective nuclear charge is directly proportional to the positive charge.

Thus more the positive charge less the size. Therefore, order of size is : $S ^{2-}\,> \,K ^{+}\,> \,Sc ^{3+}\,>\, V ^{5+}\,> \,Mn ^{7+}$

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