Which element has the highest electronegativity in the periodic table ?
Fluorine
Electronegativity is the tendency of an atom in a bond to attract the shared pair of electrons towards itself; it increases across a period from left to right and decreases down a group.
Fluorine sits at the top right of the periodic table (Group 17, Period 2), has a very small atomic size and a high effective nuclear charge, so it has the highest value, about 4.0 on the Pauling scale.
Check: oxygen (about 3.4), chlorine (about 3.2) and nitrogen (about 3.0) all have lower values than fluorine.
Hence, Fluorine.
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