First slide

Periodicity in atomic properties

Question

Which is not the correct order for the stated property

Moderate

A

$Ba > Sr > Mg :$ atomic radius
B

$F > 0 > N :$ first ionisation enthalpy
C

$C I > F > I :$ electron affinity
D

$0 < S e > T e :$ electronegativity

Solution

On moving along the period, ionisation enthalpy increases.
In second period. the order of ionisation enthalpy should be as follows : $F > 0 > N :$
But $N$ has half-filled structure. therefore, it is more stable than $O$ . That's why its ionisation enthalpy is higher than $O$ Thus, the correct order of $I E$ is $F > N > O$ ..

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