Is Sulfur Dioxide (SO2) Ionic or Covalent?
Is Sulfur Dioxide (SO2) ionic or covalent?
SO2 has polar S=O bonds in a bent geometry. Unlike CO2, the bent shape means the dipoles do not cancel, making SO2 a polar molecule.
| Formula | SO2 |
| Name | Sulfur Dioxide |
| Bond Type | Polar Covalent |
| EN Values | S: 2.58, O: 3.44 |
| EN Difference | 0.86 |
| Electron Behavior | Unequal sharing |
| Melting Point | -72 C (low) |
| Conductivity | Does not conduct electricity |
| Solubility | Soluble in water (reacts to form H2SO3) |
| Key Concept | Bent geometry prevents dipole cancellation |
Overview
Sulfur dioxide has a bent molecular geometry with two S=O double bonds. A lone pair on sulfur creates the bent shape.
Electronegativity Analysis
S has EN 2.58, O has 3.44. The difference of 0.86 makes each S=O bond polar covalent.
Electron Behavior
Electrons in each S=O bond are pulled toward oxygen. The bent geometry means these dipoles add up rather than cancel.
Physical Properties
SO2 is a polar gas with a pungent odor. It dissolves readily in water to form sulfurous acid (H2SO3).
See electronegativity values, partial charges, and bond character on interactive 3D molecules.
Visualize Sulfur Dioxide's Bonding in 3DRelated Topics
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Interactive Periodic Table
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