Topic : Isoelectronic species

 

If the species having same number of total electron present in the molecule called isoelectronic species. 

To understand isoelectronic species we take a example = we have two molecules CH3- ion (methyl anion) and NH3 (ammonia) 

(1) CH3-   :  we know that carbon has 6 electron (atomic no. = 6) in all the shells and hydrogen (atomic no. =1)  having one electron in all the shells. 

Here three hydrogen atom attached with carbon. So the total  electron of hydrogen are three.  

In CH3- ion there is one negative charge, it means carbon take one electron from other species. 

: carbon has 7 electron 

Total electron in CH3-  species are  =

6+3+1 =  10 electron

(2) NH3 -   we know that in NH3 molecule nitrogen (atomic no =7) has 7 electron in all the shells (not valence shell). 

And hydrogen  attached with nitrogen are three. 

So the total electron present in ammonia molecule are =7+3 =10electron

(there is no positive or negative charge on ammmonia molecule)

Note= if molecule has contain positive charge then we subtract that positive charge from total no.  of electron. 

Therefore :  both molecule CH3- and NH3 has  10 electron. 

Both  molecule are isoelectronic. 

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