Fluorine is the most electronegative element, followed by chlorine, phosphorus, nitrogen, etc.
BF₃> CF₄> NF₃
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 exactly proportional to the percentage of ionic character. F (4.0), N (3.0), C (2.5), B (2.0), and E.N (Difference of Electronegativity) between (N and F = 4 - 3 = 1), (B and F = 4 - 2 = 2), and (C and F = 4 - 2.5 = 1.5) are all in accordance with the Pauling En Scale.
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