Unit cell of cubic polonium dioxide (white = Po, yellow = O)
Names
Systematic IUPAC name
Polonium dioxide
Identifiers
CAS Number
7446-06-2
ChemSpider
52083691
UNII
JC742031MYY
Properties
Chemical formula
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
Crystal structure
fluorite, Pearson symbol cF12
Space group
Fm3m (No 225)
Lattice constant
a = 0.5637 nm[3]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Chemical compound
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]
^ abcdHaynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). CRC Press. p. 4.81. ISBN 978-1-4398-5511-9.
^ abcHolleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, p. 594, ISBN 0-12-352651-5
^ abBagnall, K. W.; D'Eye, R. W. M. (1954). "The Preparation of Polonium Metal and Polonium Dioxide". J. Chem. Soc. RSC: 4295–4299. doi:10.1039/JR9540004295. Retrieved 12 June 2012.
^Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 780. ISBN 978-0-08-037941-8.
^Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, p. 585, ISBN 0-12-352651-5
Poloniumdioxide (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...
one of three oxides of polonium, the other two being polonium monoxide (PoO) and poloniumdioxide (PoO2). It is an interchalcogen that has so far only...
temperature. Tetrahalides can be obtained by reacting poloniumdioxide with HCl, HBr or HI. Other polonium compounds include the polonite, potassium polonite;...
Sulfur dioxide (IUPAC-recommended spelling) or sulphur dioxide (traditional Commonwealth English) is the chemical compound with the formula SO 2. It is...
polonium, the other two being poloniumdioxide (PoO2) and polonium trioxide (PoO3). It is an interchalcogen. Polonium monoxide is a black solid. It is...
bromine and polonium at 200 °C to 250 °C. Like polonium tetraiodide, polonium tetrabromide can also be produced by the reaction of poloniumdioxide and hydrogen...
dissolving of polonium metal in hydrochloric acid; heating poloniumdioxide to 200 °C in carbon tetrachloride vapour; reaction of polonium metal with dry...
there. The Dayton Project developed techniques for extracting polonium from the lead dioxide ore in which it occurs naturally, and from bismuth targets that...
sulfur (S), selenium (Se), tellurium (Te), and the radioactive elements polonium (Po) and livermorium (Lv). Often, oxygen is treated separately from the...
elements are less frequently so classified: carbon, aluminium, selenium, polonium and astatine. On a standard periodic table, all eleven elements are in...
Polonium dichloride is a chemical compound of the radioactive metalloid, polonium and chlorine. Its chemical formula is PoCl2. It is an ionic salt. Polonium...
Tellurium dioxide (TeO2) is a solid oxide of tellurium. It is encountered in two different forms, the yellow orthorhombic mineral tellurite, β-TeO2, and...
suitable for the direct conversion of heat to electrical energy using polonium-210 as the heat source. RTGs were developed in the US during the late 1950s...
uranium-238, and uranium-235. Examples include the natural isotopes of polonium and radium. Cosmogenic isotopes, such as carbon-14, are present because...
in industry. The principal gases provided are nitrogen, oxygen, carbon dioxide, argon, hydrogen, helium and acetylene, although many other gases and mixtures...
which tarnishes olive gray when it is exposed to air, forming thorium dioxide; it is moderately soft and malleable and has a high melting point. Thorium...
chalcogen atoms (elements of group 16: oxygen, sulfur, selenium, tellurium, polonium, and livermorium). Water, the first chemical compound in this series, contains...
by the Kroll and Hunter processes. The most common compound, titanium dioxide, is a popular photocatalyst and is used in the manufacture of white pigments...
amounts of other higher alkanes. Low levels of trace gases like carbon dioxide, nitrogen, hydrogen sulfide, and helium are also usually present. Methane...
astatine. Germanium bonds to all natural single chalcogens except polonium, and forms dioxides, disulfides, and diselenides. Germanium nitride has the formula...
of iodine vapor on polonium metal: Po + 2 I 2 ⟶ PoI 4 {\displaystyle {\ce {Po + 2I2 -> PoI4}}} 2. Dissolution of poloniumdioxide in hydroiodic acid:...
radioactive. After bismuth, which has a half-life or more than 1019 years, polonium, astatine, and radon are some of the shortest-lived and rarest elements...
small but significant amounts of the highly dangerous radioactive isotope polonium-210 were also released. It is estimated that the radiation leak may have...
he clearly distinguished it from Joseph Black's "fixed air", or carbon dioxide. The fact that there was a component of air that does not support combustion...
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