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JIPMER2019ChemistryStructure of Atom

Which of the following is not iso electronic with H ₂ ~S ?

Options

  1. AF₂ gas
  2. Boxide ion
  3. CCa ⁺²
  4. DSc ⁺³

Correct answer

B. oxide ion

Step-by-step solution

Key Idea Iso electronic species are those which have same number of electrons. The total number of electrons in the given species are as follows aligned H ₂ ~S & =2+16=18 electrons F ₂ & =9+9=18 electrons O ²⁻ & =8+2=10 electrons Ca ²⁺ & =20-2=18 electrons Sc ³⁺ & =21-3=18 electrons aligned Thus, O ²⁻ (oxide ion) is not iso electronic with H ₂ ~S .

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