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NEET2021ChemistryStructure of AtomActual

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

Options

  1. AO 2 - , F -
  2. BNa + , Mg + 2
  3. CMn 2 + , Fe 3 +
  4. DFe 2 + , Mn 2 +

Correct answer

D. Fe 2 + , Mn 2 +

Step-by-step solution

1 ) O 2 - , F - Both have 10 electrons 2 ) Na + , Mg + 2 Both have 10 electrons 3 ) Mn 2 + , Fe + 3 Both have 23 electrons 4 ) Mn 2 + has 23 electrons while, Fe + 2 have 24 electrons so, they are not an iso-electronic pair.

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