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Class 11
Chemistry
Classification of Elements and Periodicity in Properties
what do you understand by isoelectronic species n...

Question:
What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.

(i) F^–

(ii) Ar

(iii) Mg²⁺

(iv) Rb⁺

Answer:

Isoelectronic species/ions/atoms are the species which have same number of electrons but different magnitude of nuclear charges and belongs to different atoms or ions.The isoelctronic ions with greater nuclear charge will have small size as compared to the ion with smaller nuclear charge.

(i) F^–ion has 9 + 1 = 10 electrons. Thus, the species isoelectronic with it will also have 10 electrons. Some of its isoelectronic species are Na⁺ion (11 – 1 = 10 electrons), Ne (10 electrons), O^2–ion (8 + 2 = 10 electrons), and Al³⁺ ion (13 – 3 = 10 electrons).

(ii) Ar has 18 electrons. Thus, the species isoelectronic with it will also have 18 electrons. Some of its isoelectronic species are S^2– ion (16 + 2 = 18 electrons), Cl^–ion (17 + 1 = 18 electrons), K⁺ ion (19 – 1 = 18 electrons), and Ca²⁺ ion (20 – 2 = 18 electrons).

(iii) Mg²⁺ ion has 12 – 2 = 10 electrons. Thus, the species isoelectronic with it will also have 10 electrons. Some of its isoelectronic species are F^–ion (9 + 1 = 10 electrons), Ne (10 electrons), O^2– ion (8 + 2 = 10 electrons), and Al³⁺ion (13 – 3 = 10 electrons).

(iv) Rb⁺ion has 37 – 1 = 36 electrons. Thus, the species isoelectronic with it will also have 36 electrons. Some of its isoelectronic species are Br^– ion (35 + 1 = 36 electrons), Kr (36 electrons), and Sr²⁺ ion (38 – 2 = 36 electrons).

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Question:
What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.

(i) F^–

(ii) Ar

(iii) Mg²⁺

(iv) Rb⁺

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Question: What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions. (i) F– (ii) Ar (iii) Mg2+ (iv) Rb+

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Question:
What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.

(i) F^–

(ii) Ar

(iii) Mg²⁺

(iv) Rb⁺