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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

O2- , 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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