Fluorine is the element that is the most electronegative, followed by chlorine, phosphorus, nitrogen, etc.
Negative ions are typically made up of atoms with strong electronegativity. Ionic compounds developed between element with vastly different electronegativity. % The difference in electronegativity is directly proportional to ionic nature. According to the Pauling En Scale, the electronegativity difference between P and F is (P and F = 4 - 2.19 = 1.81), P and Br is (P and Br = 2.96 - 2.19 = 0.77), and P and Cl is (P and Cl = 3.16 - 2.96 = 0.2).
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