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JEE Main 20231 FebruaryEvening Shift
Exam
JEE Main
Year
2023
Date
1 February
Shift
Evening Shift
Subject
Chemistry
Chapter
Structure of Atom

JEE Main 2023 · 1 February · Evening Shift · Chemistry · Structure of Atom

Which one of the following sets of ions represents a collection of...

Which one of the following sets of ions represents a collection of isoelectronic species?

(Given : Atomic Number :F:9,Cl:17,Na=11: F: 9, Cl: 17, Na = 11

Mg=12,Al=13,K=19,Ca=20,Sc=21)Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21 )

Options

  1. A(Li+,Na+,Mg2+,Ca2+)\left({Li}^{+}, {Na}^{+}, {Mg}^{2 +}, {Ca}^{2 +}\right)
  2. B(Ba2+,Sr2+,K+,Ca2+)\left({Ba}^{2 +}, {Sr}^{2 +}, K + , {Ca}^{2 +}\right)
  3. C(N3−,O2−,F−,S2−)\left({N}^{3 -}, {O}^{2 -}, {F}^{-}, {S}^{2 -}\right)
  4. D(K+,Cl−,Ca2+,Sc3+)\left({K}^{+}, {Cl}^{-}, {Ca}^{2 +}, {Sc}^{3 +}\right)

Correct answer

D. (K+,Cl−,Ca2+,Sc3+)\left({K}^{+}, {Cl}^{-}, {Ca}^{2 +}, {Sc}^{3 +}\right)

Step-by-step solution

Isoelectronic species have same no. of electrons. Below are the isoelectronic species with their respective no. of electrons:
{K+Cl−Ca2+Sc3+18181818\begin{cases}{K}^{+} & {Cl}^{-} & {Ca}^{2 +} & {Sc}^{3 +} \\ 18 & 18 & 18 & 18\end{cases}
All of the above elements have the electronic configuration of argon.
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