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

Question

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 )

TestHub · Accepted Answer

Isoelectronic species have same no. of electrons. Below are the isoelectronic species with their respective no. of electrons:
$\begin{matrix} K^{+} & {Cl}^{-} & {Ca}^{2 +} & {Sc}^{3 +} \\ 18 & 18 & 18 & 18 \end{matrix}$
All of the above elements have the electronic configuration of argon.

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