Electronegativity Calculator

Quickly determine electronegativity values for elements with our handy tool. A must-have for chemistry students and researchers.

First Element
Second Element
Electronegativity Difference (END)
Electronegativity of first element (XA)
Electronegativity of second element (XB)

Electronegativity, a cornerstone concept in chemistry, unlocks the secrets of chemical bonds and interactions between atoms. It gauges an atom's ability to attract and grip electrons, dictating the types of bonds formed in compounds.

This powerful tool, pioneered by Linus Pauling, sheds light on predicting chemical reactions, deciphering molecular structures, and navigating the diverse behaviors of elements.


In essence, electronegativity measures an atom's eagerness to attract a pair of electrons it shares in a bond. This property explains the unequal sharing of electrons between different elements in a compound.

A higher electronegativity value translates to a stronger electron attraction, leading to a lopsided distribution of charge within the molecule.


Counterbalancing electronegativity is electropositivity, which quantifies an atom's willingness to donate electrons during bond formation. It reflects an atom's tendency to lose electrons and become a positively charged ion.

While electronegativity focuses on grabbing electrons, electropositivity emphasizes giving them away, and understanding both concepts paints a comprehensive picture of chemical bonding.

Electronegativity Formula

The electronegativity of an element is often quantified using various scales, with one of the most widely used being the Pauling scale.

The Pauling electronegativity (X) is calculated using the following formula:



Electronegativity is often expressed through various scales, with the Pauling scale reigning supreme. The Pauling electronegativity (X) is calculated using a formula that considers the number of atoms sharing the electrons.

Remember, this scale is relative, and values are dimensionless. The range spans from roughly 0.7 for cesium to 4.0 for fluorine, with higher values signifying a stronger grip on electrons.

Beyond Pauling: Other Electronegativity Scales

While the Pauling scale holds prominence, other options exist, like the Mulliken and Allred-Rochow scales, each with their own formula and set of values. The choice depends on the specific application or the nature of the chemical system under study.

Factors Shaping Electronegativity

Several factors influence an element's electronegativity, including its size and the charge of its nucleus. Generally, smaller atoms with higher nuclear charges boast higher electronegativity.

Additionally, the effective nuclear charge, electron shielding, and configuration all play a role in the periodic variation of electronegativity.

Fluorine reigns supreme in the electronegativity kingdom, its formidable electron-attracting prowess playing a crucial role in forming polar covalent bonds and stabilizing diverse compounds.

On the other end of the spectrum, cesium, with its large size and low nuclear pull, holds the title of least electronegative element. This characteristic makes it highly electropositive.

Electronegativity Trends

Across a period, the trend is clear: electronegativity increases. This can be attributed to the shrinking atomic size and the increasing nuclear charge.

As atoms get smaller and the positive pull of the nucleus intensifies, the attraction for electrons strengthens, leading to higher electronegativity values.

Electronegativity vs. Electron Affinity

Electron affinity focuses on the energy change when an atom grabs an electron, while electronegativity measures the tendency to attract electrons in a bond. Both concepts deal with electrons, but they approach them from different angles.

Frequently Asked Questions

The bigger the electronegativity difference between two atoms, the more polar the bond becomes.

Fluorine, with its similar electronegativity, contributes to the strong hydrogen-fluorine bond in compounds like HF.

No, it's typically positive, reflecting the relative tendency to attract electrons compared to other elements.

Elements with higher electronegativity are more likely to form compounds through electron attraction, influencing their reactivity and bond-forming tendencies.

This ultimately leads to increased efficiency and, in turn, a longer lifespan for your batteries.