Question

Answer Type 4. Among the following ions, the set with isoelectronic ions iswhich one of the following is the smallest in size ​

Answer 1

Answer:

Correct option is c - Cl−,K+,S2−

• Isoelectronic ions are those ions having the same number on electrons.

                                   No. of electrons 

• Cl−(Z=17)   :     17+1=18

• K+(Z=19)   :     19−1=18

• S2−(Z=16)     :   16+2(1)=18

• All have 18 electrons, thus Cl−,K+,S2− are iso-electronic ions.