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| hydride type | hydrogen bond nature | common example |
|---|---|---|
| Covalent or volatile | Nonpolar electron sharing type, low melting point, absence of strong intermolecular forces | Aluminum, tin, boron, and germanium hydrides |
| Ionic or Saline | Presence of strong electrostatic forces, highly polar, high melting point | MgH2, CaH2, and SrH2 |
| Metallic | High thermal conductivity and electrical resistivity, portable sources of hydrogen | Titanium, thorium, and zirconium hydrides |
