Q.
Arrange F, Cl, O, N in the decreasing order of electronegativity-
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Classification of Elements and Periodicity in Properties
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Solution:
Electronegativity(E.N) of elements are; F=4,Cl=3,N=3,O=3.5.
Therefore, the trend is : F>O>N=Cl.
This can be explained as, on moving from left to right across a period, the E.N increases and also on moving down a group from top to bottom the E.N decreases.