Polonium dioxide
Polonium dioxide (also known as polonium(IV) oxide) is a chemical compound with the formula PoO2. It is one of three oxides of polonium, the other two being polonium monoxide (PoO) and polonium trioxide (PoO3). It is a pale yellow crystalline solid at room temperature. Under lowered pressure (such as a vacuum), it decomposes into elemental polonium and oxygen at 500 °C. It is the most stable oxide of polonium and is an interchalcogen.
| Names | |
|---|---|
| Systematic IUPAC name
Polonium dioxide | |
| Identifiers | |
| ChemSpider | |
| UNII | |
| Properties | |
| PoO2 | |
| Molar mass | 240.98 g/mol |
| Appearance | pale yellow crystalline solid |
| Density | 8.9 g/cm3 |
| Melting point | 500 °C (932 °F; 773 K) (decomposes) sublimes at 885 °C (under oxygen) |
| Structure | |
| fluorite, Pearson symbol cF12 | |
| Fm3m (No 225) | |
a = 0.5637 nm | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
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