Electronegativity Calculator

Electronegativity quantifies an atom's tendency to attract shared electrons toward itself in a chemical bond. To find the electronegativity difference (ΔEN) between two elements, the calculator uses the absolute value formula: ΔEN = |EN₁ - EN₂|, where EN₁ and EN₂ represent the electronegativity values of the first and second elements on the Pauling scale. This absolute difference provides a dimensionless metric that directly correlates with bond polarity.

Let us calculate the electronegativity difference for sodium chloride (NaCl). Sodium (Na) has a Pauling electronegativity of approximately 0.93, while chlorine (Cl) has an electronegativity of approximately 3.16. Applying our formula, ΔEN = |0.93 - 3.16| = |-2.23| = 2.23. Because the resulting difference is greater than 1.7, this calculation correctly predicts that sodium and chlorine form a strong ionic bond due to the extreme transfer of electron density.

Use standard thresholds to interpret your results: a ΔEN below 0.4 typically indicates a nonpolar covalent bond, a value between 0.4 and 1.7 points to a polar covalent bond, and a value above 1.7 signifies an ionic bond. Always ensure you are using consistent electronegativity scales—such as the widely accepted Pauling scale—when comparing values across different periodic table elements.