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NEETChemistryStructure of Atom

Which of the following are isoelectronic species i.e., those having the same number of electrons among Na + , K + , Mg 2+ , Ca 2+ , S 2– , Ar ?

Options

  1. ANa + ,K + (10 electrons each) and Ca 2+ , Ar, S 2– ,Mg 2+ (18 electrons each)
  2. BNa + ,Mg 2+ (10 electrons each) and Ca 2+ , Ar, S 2– ,K + (18 electrons each)
  3. CCa 2+ ,Ar(10 electrons each) and Na + ,Mg 2+ ,S 2– ,K + (18 electrons each)
  4. DNa + ,Ar(10 electrons each) and Ca 2+ ,Mg 2+ ,S 2– ,K + (18 electrons each)

Correct answer

B. Na + ,Mg 2+ (10 electrons each) and Ca 2+ , Ar, S 2– ,K + (18 electrons each)

Step-by-step solution

Correct Option is : (B) Na + ,Mg 2+ (10 electrons each) and Ca 2+ , Ar, S 2– ,K + (18 electrons each)

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