| Reactions of Technetium |
 Reactions with water |
| Technetium does not react with water under normal conditions. |
| Reactions with air |
| Technetium tarnishes only very slowly in moist air. In practice, technetium is often supplied as a powder or as a sponge,
and in this form it is much more reactive. When heated with oxygen the result is technetium (VII) oxide, (techentium heptoxide, Tc2O7).
|
4Tc(s) + 7O2(g) 2Tc2O7(s) |
| Reactions with halogens |
| technetium is often supplied as a powder or as a sponge, and in this form it is quite more reactive. When heated with fluorine the result is a mixture of technetium (VI) fluoride.
|
| Tc(s) + 3F2(g)TcF6(s) |
| 2Tc(s) + 7F2(g)2TcF7(s) |
| Technetium metal does dissolve in warm bromine water.
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| Reactions with acids |
| Technetium is insoluble in hydrochloric acid (HCl) and hydrofluoric acid (HF). It does dissolve in nitric acid, HNO3, or concentrated sulphuric acid, H2SO4, both of which are oxidizing, to form solutions of pertechnetic acid, HTcO4. In this form, the technetium is in the formal +7 oxidation state.
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