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) [2023]

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Q.
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) [2023]

Solution

Q.
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) [2023]

1 $N^{3 -}, O^{2 -}, F^{-}, S^{2 -}$

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

3 ${Ba}^{2 +}, {Sr}^{2 +}, K^{+}, {Ca}^{2 +}$

4 $K^{+}, {Cl}^{-}, {Ca}^{2 +}, {Sc}^{3 +}$

Ans.
(4)

${Ca}^{+ 2}, K^{+}, {Sc}^{3 +}, {Cl}^{-}$ contain same no. of electrons, i.e. 18.

Hence they are iso-electronic species.

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Solution

Q. 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) [2023]

1 N3-,O2-,F-,S2-

2 Li+,Na+,Mg2+,Ca2+

3 Ba2+,Sr2+,K+,Ca2+

4 K+,Cl-,Ca2+,Sc3+

Ans. (4) Ca+2,K+,Sc3+,Cl- contain same no. of electrons, i.e. 18. Hence they are iso-electronic species.

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Q.
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) [2023]

1 $N^{3 -}, O^{2 -}, F^{-}, S^{2 -}$

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

3 ${Ba}^{2 +}, {Sr}^{2 +}, K^{+}, {Ca}^{2 +}$

4 $K^{+}, {Cl}^{-}, {Ca}^{2 +}, {Sc}^{3 +}$

Ans.
(4)

${Ca}^{+ 2}, K^{+}, {Sc}^{3 +}, {Cl}^{-}$ contain same no. of electrons, i.e. 18.

Hence they are iso-electronic species.