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Which one of the following sets of ions represents a collection of isoelectronic species?
(Given : Atomic Number: F:9, Cl:17, Na= 11, Mg = 12, Al= 13, K=19, Ca=20, Sc=21)

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$N^{3 -}, O^{2 -}, F^{-}, S^{2 -}$

${Ba}^{2 +}, {Sr}^{2 +}, K^{+}, {Ca}^{2 +}$

$K^{+}, {Cl}^{-}, {Ca}^{2 +}, {Sc}^{3 +}$

${Li}^{+}, {Na}^{+}, {Mg}^{2 +}, {Ca}^{2 +}$

answer is C.

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Detailed Solution

The species which are having same no. of electrons are called “isoelectronic species”

Ion	K⁺	Cl^-	Ca⁺²	Sc⁺³
Original electrons	19	17	20	21
Electrons Gain/lost	-1	+1	-2	+3
Net electrons	18	18	18	18

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