A) P
B) S
C) Mg
D) Al
Correct Answer: A
Solution :
Though ionisation energy, generally increases from left to right in a period, but elements of II A and V A groups have higher ionisation than corresponding III A and VI A group elements (true upto IVth period). The reason is their comparatively stabler electronic configuration (\[n{{s}^{2}}\]and \[n{{s}^{2}}n{{p}^{3}}\]respectively.) Hence, in the light of above discussion, we can conclude that ionisation potential of phosphorus should be the highest among given element and it is found so \[I{{E}_{1}}\] for P= 1012 kJ \[\text{mo}{{\text{l}}^{-1}}\] \[I{{E}_{1}}\] for S = 999 kJ \[\text{mo}{{\text{l}}^{-1}}\]
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