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COMEDK2022ChemistryStructure of Atom

O ²⁻ , F ^- , Mg ²⁺ , Al ³⁺ , O ₂ , F ₂ . How many of the species given above are isoelectronic?

Options

  1. A4
  2. B2
  3. C3
  4. D5

Correct answer

A. 4

Step-by-step solution

Isoelectronic species have the same number of electrons. O²⁻ : 8 + 2 = 10 electrons F^- : 9 + 1 = 10 electrons Mg²⁺ : 12 - 2 = 10 electrons Al³⁺ : 13 - 3 = 10 electrons O₂ : 2 8 = 16 electrons F₂ : 2 9 = 18 electrons O²⁻ , F^- , Mg²⁺ , and Al³⁺ all have 10 electrons. Thus 4 species are isoelectronic.

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