Fluorine is the most electronegative element, followed by chlorine, phosphorus, nitrogen, etc.
TeF₄> BrF₃> SeF₄
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. matching the Pauling En Scale for F (4.0), Se (2.55), Te (2.1) and Br (2.96) ΔE.N (Difference of electronegativity) between (Se and F = 4 – 2.55 = 1.45), (F and Te = 4 – 2.1 = 1.9), (F and Br = 4 – 2.19 = 1.81)
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