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NTA Abhyas JEE Main2020ChemistryClassification of Elements and Periodicity in PropertiesPractice

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

Options

  1. AMg 2 +
  2. BO 2 -
  3. CF -
  4. DCa 2 +

Correct answer

D. Ca 2 +

Step-by-step solution

20 Ca = 2 , 8 , 8 , 2 Ca 2 + = 2 , 8 , 8 Hence, Ca 2 + has 8 electrons each in outermost and penultimate shell.

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