First slide
Periodicity in atomic properties
Question

Which of the following sets does not contain isoelectronic species ?

Moderate
Solution

(1) BO33,CO32,NO3 All have 32 electrons in them 

(2) SO32,CO32,NO3SO32 have 42 electrons in them while CO32,NO3have 32 electrons in them 

(3) CN,N2,C22 All have 14 electrons in them 

(4) PO43,SO42,ClO4 All have 50 electrons in them 

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