Among the following, the least 
ionization energy is for:
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Consider an element 
would be the 3rd I.E. of the element 
.
Electronic configuration of 
is 
Electronic configuration of Co is 
Electronic configuration of 
is 
Electronic configuration of 
is 
Electronic configuration of 
is 
Electronic configuration of 
is 
Electronic configuration of 
is 
Electronic configuration of 
is 
As it is evident from the above configurations of the 
for the given elements, 
would require the least amount of energy for removal of electron as it has the configuration 
. That means that its 
form is the most stable among the four elements provided in their respective 
states, i.e., when compared, the next electron removal will require least amount of energy.
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