Electronegativity Calculator
The Electronegativity Calculator compares the ability of two elements to attract shared electrons in a chemical bond. Select two elements to find their electronegativity values on the Pauling scale and calculate the electronegativity difference instantly.
The calculator also identifies which element is more electronegative and provides a useful indication of the likely bond character. A step-by-step solution shows exactly how the electronegativity difference was obtained.
Calculate Electronegativity Difference
What Is Electronegativity?
Electronegativity is a measure of an atom's ability to attract shared electrons toward itself when it forms a chemical bond.
When two bonded atoms have different electronegativities, the bonding electrons are attracted more strongly toward the atom with the higher electronegativity.
Pauling Electronegativity Scale
This calculator uses values from the Pauling electronegativity scale. Fluorine has the highest commonly used Pauling electronegativity value, approximately 3.98.
Here, ΔEN represents the electronegativity difference and EN₁ and EN₂ represent the electronegativities of the two elements.
How to Calculate Electronegativity Difference
The electronegativity difference between two atoms is calculated by taking the absolute difference between their electronegativity values.
The absolute value is used because the order in which the two elements are entered does not affect the magnitude of the difference.
How to Use This Electronegativity Calculator
- Select the first element from the dropdown.
- Select the second element.
- Click Calculate.
- The Pauling electronegativity of both elements will be displayed.
- The calculator finds the absolute electronegativity difference.
- The more electronegative element and estimated bond character are displayed.
- Click Show Step-by-Step Solution to see the complete calculation.
Electronegativity Difference and Bond Character
Electronegativity difference is commonly used as a guide when discussing bond polarity. A small difference generally indicates that the bonding electrons are shared more evenly, while a larger difference indicates greater polarity and increasing ionic character.
The following ranges are useful general guidelines rather than strict rules:
| Electronegativity Difference | General Bond Character |
|---|---|
| 0.00 – 0.39 | Generally nonpolar covalent |
| 0.40 – 1.69 | Generally polar covalent |
| 1.70 and above | Increasing ionic character |
These boundaries should be treated as approximate guidelines. The actual nature of a chemical bond depends on the atoms involved and their molecular environment.
Electronegativity Difference Examples
Sodium has a Pauling electronegativity of 0.93, while chlorine has a value of 3.16.
ΔEN = 2.23
The large difference indicates substantial ionic character in the Na–Cl bond.
Hydrogen has an electronegativity of 2.20 and chlorine has an electronegativity of 3.16.
ΔEN = 0.96
This difference is consistent with a polar covalent H–Cl bond.
Hydrogen has an electronegativity of 2.20 and oxygen has an electronegativity of 3.44.
ΔEN = 1.24
Oxygen is more electronegative than hydrogen, so the O–H bond has significant polarity.
Carbon has an electronegativity of 2.55 and oxygen has an electronegativity of 3.44.
ΔEN = 0.89
Oxygen attracts the bonding electrons more strongly than carbon.
Electronegativity Trend in the Periodic Table
Electronegativity generally increases from left to right across a period. This trend is associated with an increase in effective nuclear charge, which strengthens the attraction between the nucleus and bonding electrons.
Electronegativity generally decreases as we move down a group. Additional electron shells increase the distance between the nucleus and the outer electrons and increase shielding.
Fluorine is the most electronegative element on the commonly used Pauling scale, with a value of approximately 3.98.
Pauling Electronegativity Values of Elements
The table below provides the electronegativity values used by this calculator where a standard Pauling value is available.
| Element | Symbol | Atomic Number | Pauling Electronegativity |
|---|
Frequently Asked Questions
What is an electronegativity calculator?
An electronegativity calculator compares the electronegativity values of two elements and calculates their electronegativity difference. The result can help estimate the polarity and character of a chemical bond.
What scale does this calculator use?
This calculator uses the Pauling electronegativity scale.
What is the formula for electronegativity difference?
The formula is ΔEN = |EN₁ − EN₂|. The absolute value makes the calculated difference positive.
Which element has the highest electronegativity?
Fluorine has the highest commonly used Pauling electronegativity value, approximately 3.98.
What does a large electronegativity difference mean?
A large electronegativity difference means that the bonding electrons are attracted more strongly toward one atom. It generally corresponds to greater bond polarity and, at sufficiently large differences, increasing ionic character.
Which atom is more electronegative?
The atom with the larger Pauling electronegativity value is the more electronegative atom.
Can electronegativity difference determine bond type exactly?
No. Electronegativity difference is a useful guideline for discussing bond character, but it does not completely determine the nature of a chemical bond.