The atom that is the most electronegative is fluorine (F).
Electronegativity, is the tendency for an atom of a given chemical element to attract shared electrons when forming a chemical bond.
Electronegativity increases across the groups from left to right of the periodic table and decreases down the group.
Examples of electronegative elements arranged in decreasing order;
Thus, the atom that is the most electronegative is fluorine (F).
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