Chemistry — Electronegativity & Bond Polarity
Using electronegativity difference to classify bonds.
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\Delta\chi = |\chi_A - \chi_B|
\Delta\chi > 1.7 \Rightarrow \text{ionic}
0.4 < \Delta\chi < 1.7 \Rightarrow \text{polar covalent}
\Delta\chi < 0.4 \Rightarrow \text{nonpolar}