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Compounds | Reactions | Production
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| Reactions of Neptunium |
 Reactions with air |
| Neptunium reacts with oxygen to form oxides of the various compositions such as are found in the uranium-oxygen system, including Np3O8 and NpO2. |
| Reactions with halogens |
| Neptunium forms tri- and tetrahalides such as NpF3, NpF4, NpCl4, NpBr3, NpI3. |