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Q.

From the following pairs of ions which one is not an iso - electronic pair ?

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a

Fe²⁺ , Mn²⁺

b

O^2- , F^-

c

Na⁺ , Mg²⁺

d

Mn²⁺ , Fe³⁺

answer is A.

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Detailed Solution

Isoelectronic refers to two atoms, ions, or molecules that have the same number of total electrons and the same number of valence electrons.
(a) O²⁻ and F⁻both have 10 electrons
(b) Na⁺ and Mg²⁺ both have 10 electrons
(c) Mn²⁺ and Fe³⁺ both have 23 electrons
(d) Fe²⁺ has 24 electrons. Mn²⁺ has 23 electrons.

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From the following pairs of ions which one is not an iso - electronic pair ?