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Q. Arrange F, Cl, O, N in the decreasing order of electronegativity-

Classification of Elements and Periodicity in Properties

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.