Is Hydrogen Fluoride (HF) Ionic or Covalent?
Is Hydrogen Fluoride (HF) ionic or covalent?
HF sits near the boundary between polar covalent and ionic. Fluorine (EN 3.98) strongly pulls shared electrons from hydrogen (EN 2.20), creating significant partial charges.
| Formula | HF |
| Name | Hydrogen Fluoride |
| Bond Type | Polar Covalent |
| EN Values | H: 2.2, F: 3.98 |
| EN Difference | 1.78 |
| Electron Behavior | Unequal sharing |
| Melting Point | -83 C (low for polar) |
| Conductivity | Weak conductor in solution |
| Solubility | Soluble in water |
| Key Concept | High polarity near the ionic/covalent boundary |
Overview
Hydrogen fluoride has one of the most polar covalent bonds. It sits right at the boundary between polar covalent and ionic character.
Electronegativity Analysis
Hydrogen has an EN of 2.20, fluorine has 3.98 (the highest of any element). The difference of 1.78 is near the 1.7 ionic threshold.
Electron Behavior
Electrons are shared but strongly pulled toward fluorine. This creates large partial charges, almost but not quite reaching full electron transfer.
Physical Properties
Despite having just two atoms, HF is a liquid at room temperature due to strong hydrogen bonding. It is a weak acid in water (pKa 3.17).
See electronegativity values, partial charges, and bond character on interactive 3D molecules.
Visualize Hydrogen Fluoride's Bonding in 3DRelated Topics
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Interactive Periodic Table
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