Electronegativity Calculator
Compare Pauling electronegativities and explore the direction and approximate character of a bond.
01 Set up your calculation
- Choose two common elements or select Custom value.
- Use values from the same electronegativity scale.
- Read the absolute difference and interpret the bond guide alongside the actual structure.
02 The relationship
For the assumptions behind these results, read the explanation below. You can also explore Bond Order and Atom.
Follow the numbers
Sodium at 0.93 and chlorine at 3.16 differ by 2.23. The guide marks a strong ionic tendency, with electron density drawn toward chlorine.
03 Difference and direction answer different questions
The absolute difference measures how unequal the attraction is. The larger individual value identifies which end of a bond tends to draw electron density more strongly. Swapping the atoms leaves the difference unchanged but swaps that direction.
The common-element presets use rounded Pauling values. A custom field lets you compare other elements without assigning a fabricated value where a reliable value is unavailable.
04 A bond is not classified by one cutoff alone
The labels are teaching aids along a continuum. Bonding also depends on chemical environment and structure. A numerical threshold cannot establish that a bulk material consists of isolated molecules or an ionic lattice.
Molecular polarity further depends on geometry. Polar bonds can cancel in a symmetric molecule, so this tool does not determine a molecule’s overall dipole moment.
Questions from the notebook
Why is there no preset for every element?
Some elements do not have a commonly accepted Pauling value. Use an appropriate published value in custom mode when available.
Are 0.4 and 1.7 universal boundaries?
No. Different courses use different approximate boundaries. Treat the displayed class as a guide, not an experimental measurement.
References & reading
- OpenStax, Rice University — Chemistry 2e: Covalent Bonding ↗
Explains electronegativity, polarity, and the limitations of a numerical bond classification.
Our explanations are written for ChemistryCalc. Read how we build and check our tools. These calculations are educational estimates where the underlying model requires assumptions.