Calculator
LiveSelected method
Pauling
Inputs
A=H(2.20), B=F(3.98), Δχ = 1.78
% Ionic Character
54.71%
Saved Results
| # | Method | Inputs | % Ionic |
|---|
Example Data
Pauling method with χ values; Δχ = |χA − χB|.
| Bond | χ(A) | χ(B) | Δχ | % Ionic (Pauling) |
|---|---|---|---|---|
| Na–Cl | 0.93 | 3.16 | 2.23 | 71.15 |
| H–Cl | 2.20 | 3.16 | 0.96 | 20.58 |
| H–F | 2.20 | 3.98 | 1.78 | 54.71 |
| C–Cl | 2.55 | 3.16 | 0.61 | 8.88 |
| K–Br | 0.82 | 2.96 | 2.14 | 68.17 |
| Mg–O | 1.31 | 3.44 | 2.13 | 67.83 |
| O–H | 3.44 | 2.20 | 1.24 | 31.91 |
Formula Used
Pauling electronegativity difference
% Ionic Character ≈ (1 − e−0.25(Δχ)^2) × 100
- Δχ = |χA − χB| on the Pauling scale.
- Produces values between 0 and 100% (heuristic correlation).
Dipole moment method
% Ionic Character = ( μobs / μionic ) × 100
- μionic = q·r. If r in Å, μionic ≈ 4.8032 × r (Debye).
- μ in Debye, r in Å or pm (converted internally).
How to Use This Calculator
- Choose a method: the electronegativity difference approach or the dipole moment approach.
- Enter inputs for the chosen method. Use presets or the periodic table picker to populate χ quickly. Or type an element in the combobox.
- Optionally adjust the number of decimal places to control rounding.
- Click Calculate to view the percent ionic character and intermediate values (Δχ or μ and r).
- Click Add result to table to store the current calculation in the Saved Results list.
- Use the buttons to download the Saved Results or Example Data as CSV or PDF for reports or lab notebooks.
FAQs
No. It is an empirical correlation that generally tracks bond polarity trends. It is useful for comparisons, not as an absolute theoretical percentage.
Use it when experimental μ and a reasonable bond length are available. It reflects the fraction of charge separation relative to a fully ionic bond of the same length.
The calculator caps at 100%. Experimental uncertainties or unusual bonding situations can give unrealistic ratios; treat such cases cautiously and review inputs and units.
Inputs assume the Pauling scale. You can still use values from other scales, but the Pauling-based correlation is what the displayed formula references.
Yes. μionic = 4.8032 × r if r is in Å. If you input pm, the calculator converts to Å automatically before calculating.
The tool treats a single bond at a time. For polyatomics, analyze each bond separately or use vector sums of bond moments for molecular polarity discussions.
Different texts may use alternative empirical formulas or updated electronegativity values. Variations in μ and r also shift dipole-based estimates.