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ChemBench
Predict a bond's character from two element symbols.
A difference under 0.5 typically means nonpolar covalent (electrons shared evenly), 0.5 to 1.7 means polar covalent (shared unevenly), and above 1.7 usually means ionic (electrons transferred rather than shared).
These aren't hard boundaries — bond character exists on a continuum — but the electronegativity difference is the single most useful number for predicting whether a compound will behave more like table salt (ionic) or like water (polar covalent).
Molar mass of any chemical formula (e.g. H2O, C6H12O6, Ca(OH)2).
OpenPercent composition of an element within a chemical formula.
OpenSimplest whole-number ratio formula from elemental masses or percentages.
OpenPercent yield from actual and theoretical reaction yields.
OpenElectronegativity difference
2.23
Ionic
What you entered
Electronegativity of Na
Na= 0.93Electronegativity of Cl
Cl= 3.16Difference
|0.93 − 3.16|= 2.23Result
Difference: 2.23
A difference of 2.23 between Na and Cl indicates a ionic bond.