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I have a doubt, kindly clarify. Be2+is isoelectronic with which of the following ions?

Be2+ is isoelectronic with which of the following ions? 

  • Option 1)

    H+

  • Option 2)

    Li+

  • Option 3)

    Na+

  • Option 4)

    Mg2+

 
Answers (1)
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As we learnt in 

Isosteres -

Molecules or polyatomic ions containing same number of atoms and the same total numbers of electron are called isosteres.Generally isosteres have identical lewis structure.  

   Example\rightarrow CO,\:N_{2}\:and\:CN^{-}

-

 

 Electronic config of  Be^{2+} = 1s^{2}

Electronic config of L{i}^{+} = 1s^{2}

\therefore  Be2+ is isoelectronic unit Li^{+}


Option 1)

H+

Incorrect

Option 2)

Li+

Correct

Option 3)

Na+

Incorrect

Option 4)

Mg2+

Incorrect

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