Names | |
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Systematic IUPAC name
Polonium dioxide | |
Identifiers | |
ChemSpider | |
UNII | |
Properties | |
PoO2 | |
Molar mass | 240.98 g/mol[1] |
Appearance | pale yellow crystalline solid[1][2][3] |
Density | 8.9 g/cm3[1] |
Melting point | 500 °C (932 °F; 773 K) (decomposes)[1][2] sublimes at 885 °C (under oxygen)[2][4] |
Structure | |
fluorite, Pearson symbol cF12 | |
Fm3m (No 225) | |
a = 0.5637 nm[3]
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.[5]