Electronegativity Calculator

The Electronegativity Calculator compares Pauling electronegativity values ($\chi$) of two elements and calculates the electronegativity difference (END) to predict bond character.

$$\text{END} = |\chi_1 - \chi_2|$$

Bond classification using END:

END $\geq 2.0$: ionic bond (e.g., Na and Cl, END $= 2.23$)
$0.4 \leq$ END $< 2.0$: polar covalent bond (e.g., H and F, END $= 1.78$)
END $< 0.4$: nonpolar covalent bond

Fluorine ($\chi = 3.98$) is the most electronegative element. Cesium ($\chi = 0.79$) is among the least electronegative. The more electronegative atom attracts shared electrons more strongly in a covalent bond.

Frequently Asked Questions

What is electronegativity?

Electronegativity measures an atom's tendency to attract bonding electrons. Higher values mean stronger attraction. Pauling's scale is the most common, ranging from about 0.7 (cesium) to 3.98 (fluorine).

What is the electronegativity of chlorine?

Chlorine has a Pauling electronegativity of 3.16. It is a highly electronegative halogen, which explains why NaCl forms an ionic bond when sodium ($\chi = 0.93$) reacts with chlorine.

Does this calculator confirm a bond will form?

No. This tool only predicts bond type if the two elements were to bond. Whether a reaction actually occurs depends on additional thermodynamic and kinetic factors.

What bond type forms between hydrogen and fluorine?

H ($\chi = 2.20$) and F ($\chi = 3.98$) give END $= 1.78$, which is a polar covalent bond. The shared electrons are pulled toward fluorine, creating a partial negative charge on F.

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Electronegativity Calculator

Electronegativity Calculator

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