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Classification of Elements and Periodicity in Properties
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26/08/2021 10:44 am
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Which of the following is not the correct order for the stated property?
(a) Ba > Sr > Mg; atomic radius
(b) F > O > N : first ionization enthalpy
(c) Cl > F > I; electron affinity
(d) O > Se > Te; electronegativity
1 Answer
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26/08/2021 10:46 am
Correct answer: (b) F > O > N : first ionization enthalpy
Explanation:
On moving along the period, ionization enthalpy increases.
In second period, the order of ionization enthalpy should be as follows : F > O > N
But N has half-filled structure, therefore, it is more stable than O. That’s why its ionization enthalpy is higher than O. Thus, the correct order of IE is F > N > O.