Polonium (II) hydride or hydrogen sulfide is a compound of polonium with hydrogen , where polonium has an oxidation state of +2 and hydrogen –1 (since hydrogen is more electronegative than polonium). Polonium (II) hydride is a very toxic and radioactive liquid, chemically very unstable, and, like all polonium compounds, radioactive. The chemical formula is H 2 Po.
| Polonium hydride | |
|---|---|
 | |
| Are common | |
| Systematic name | Polonium (II) hydride |
| Traditional names | hydropolonide |
| Chem. formula | H 2 Po or PoH 2 |
| Physical properties | |
| condition | liquid unstable substance |
| Molar mass | 211.98 g / mol |
| Thermal properties | |
| T. melt. | -35.3 ° C |
| T. bale. | 36.1 ° C |
| Classification | |
| Reg. CAS number | 31060-73-8 |
| PubChem | |
| Smiles | |
| Inchi | |
| Chebi | |
| ChemSpider | |
| Security | |
| Toxicity |   |
| NFPA 704 |  four four 3 RA |
Properties
Chemicals
Polonium (II) hydride is a heavy analogue of hydrogen sulfide , hydrogen selenide and hydrogen sulfide .
It is an endothermic compound. It decomposes on heating into elements. The heat generated (more than 100 kJ / mol) is one of the largest in chalcogen-hydrogen compounds.
Physical
Under normal conditions, polonium (II) hydride is a colorless liquid with a boiling point of 36.1 ° C and a melting point of −35.3 ° C. It decomposes even at low temperatures due to the fact that polonium releases heat during radioactive decay (accordingly, polonium-209 hydride will be most stable, since its half-life is greatest). Like all polonium compounds, it is very toxic.
Synthesis
It is formed by the action of hydrogen on metallic polonium heated to 700 ° C:
- {\ displaystyle {\ mathsf {Po + H_ {2} \ rightarrow H_ {2} Po}}}
Or when dissolving polonium in hydrochloric acid in the presence of magnesium:
Toxicity
Highly toxic. Radioactive, in contact with skin penetrates inside and causes radiation damage.