In second period of the long form of the periodic table an element 
has second lowest first ionization enthalpy and element 
has second highest first ionization enthalpy values. What are 
and 
?
Text Solution
Verified by ExpertsA
IE increases along a period as the nuclear charge increases and the added electron comes in the same valence shell. But exception occurs when the element has completely filled and half-filled subshells.
The valence shell electronic configurations are:
(I.E.) 
(I.E.) 
(I.E.) 
Order:
The correct answer should be Be, F. But the correct option is not given in question.
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