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Grade 11Engineering Entrance Exams

2) The first ionization potential of Mg, Al, P and S follows the order

a) Mg < Al < P < S

b) Al < Mg < P < S

c) Al < Mg < S < P

d) Mg < Al < S < P

Profile image of Radhika Batra
12 Years agoGrade 11
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1 Answer

Profile image of Amit Saxena
ApprovedApproved Tutor Answer12 Years ago

Ans:     c

Exp:     Because of extra stability of exactly half – filled electronic configuration of p its 1st ionization potential is higher than that of s. Further the first ionization potential of Mg is higher than that of Al because in case of Mg, electron is to be removed from a 3s-orbital while in case of Al, the electron is to be removed from 3p-orbital. Thus option (c) is correct. 


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