What are Isoelectronic?
Isoelectronic is derived from two different words iso (means same) and electronic means the (number of electrons) thus the Isoelectronic are those species (atoms) molecules or compounds; having same number of electrons in them.
Na+ , Mg2+,Al3+ are some examples of Isoelectronic.
Now determining weather the CO2 and CS2 are isoelectronic?
In Carbon Dioxide CO2 case, one carbon atom is bonded with two other oxygen atoms, as we already know that the carbon atom have 4 electron in its valence shell for bonding. The carbons atom's electronic valency is 4. The bonding in CO2 is shown in its lewis diagram as given below.
Each oxygen atom having 2 valency is bonded with the same carbon atom thus the number of electrons in them are:-
6+4+6= 16 (Numbers of electrons in CO2)
Now in Carbon Disulphide (CS2) case ,
The sulphur have electronic valency of 6 electrons in its outermost shell. In CS2 Structure, one carbon atom is double bonded with two sulphur atoms. Now the number of electrons in CS2 are:-
Hence it is clear that the number os electrons in both chemical molecules Carbon Disulphide CS2 and Carbon Dioxide CO2 are the same and have same isoelectronic configuration.
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