Electronegativity Calculator

Electronegativity measures how strongly an atom pulls shared electrons toward itself in a chemical bond — and the difference between two elements determines whether their bond is nonpolar covalent, polar covalent, or ionic. Select your First Element and Second Element in the Electronegativity Calculator to see the Electronegativity Difference (ΔΧ), each element's individual electronegativity value, and the resulting Bond Type. Check the optional box to also display the Percentage Ionic Character of the bond.

Results

Electronegativity Difference (ΔΧ)

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First Element Electronegativity

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Second Element Electronegativity

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Bond Type

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Ionic Character

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Frequently Asked Questions

What is electronegativity in chemistry?

Electronegativity is a measure of an atom's ability to attract electrons when forming a chemical bond. It's a dimensionless property that helps predict how electrons will be shared or transferred between atoms in compounds.

How do you calculate electronegativity difference?

Electronegativity difference (ΔΧ) is calculated by taking the absolute value of the difference between two elements' electronegativity values: ΔΧ = |Χ₁ - Χ₂|. This value determines the bond type between the elements.

What do different electronegativity difference values mean?

ΔΧ < 0.4 indicates a nonpolar covalent bond (electrons shared equally), 0.4-1.7 indicates a polar covalent bond (unequal sharing), and ΔΧ > 1.7 indicates an ionic bond (electron transfer occurs).

Which element has the highest electronegativity?

Fluorine has the highest electronegativity value at 4.0 on the Pauling scale. This makes it extremely effective at attracting electrons in chemical bonds.

Why does electronegativity increase across a period?

Electronegativity increases across a period because the nuclear charge increases while the atomic radius decreases. This stronger nuclear pull with electrons closer to the nucleus results in greater electron-attracting ability.

How does electronegativity affect bond polarity?

The greater the electronegativity difference between two atoms, the more polar their bond becomes. Large differences create ionic bonds, while small differences result in nonpolar covalent bonds.

What is the difference between electronegativity and electron affinity?

Electronegativity measures an atom's tendency to attract electrons in a bond, while electron affinity is the energy change when an electron is added to a neutral atom. Electronegativity is relative and dimensionless, while electron affinity has units of energy.

Which scale is best for electronegativity calculations?

The Pauling scale is the most widely used and accepted electronegativity scale in general chemistry. Other scales like Allred-Rochow exist, but Pauling values are standard in most educational contexts and chemical references.