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Manipal MET2012ChemistryStructure of Atom

Which of the following species have the same number of electrons in its outermost as well as penultimate shell?

Options

  1. ACl ⁻
  2. BO ²⁻
  3. CNa ⁺
  4. DMg ²⁺

Correct answer

A. Cl ⁻

Step-by-step solution

aligned Cl ⁻ & =2,8,8 O ²⁻ & =2,8 Na ⁺ & =2,8 Mg ²⁺ & =2,8 aligned Cl ⁻ contains same number of electrons in outermost and penultimate shells.

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