Polonium (Po)

Science / Periodic Table of Elements / Polonium (Po): Atomic number: 84, Atomic mass: (210) g.mol -1, Electronegativity: 2.0, Density: 9.51 g.cm-3 at 20°C, Melting point: 254 °C, Boiling point: 962 °C, Vanderwaals radius: 0.164 nm, Ionic radius: 0.102 nm (+4), Isotopes: 12, Electronic shell: [ Xe ] 4f14 5d10 6s2 6p4, Energy of first ionisation: 813.0 kJ.mol -1, Discovered by: Pierre and Marie Curie in 1898. Polonium is a radioactive, extremely rare semi-metal. It is reactive, silvery-gray, it dissolves in dilute acids, but it is only slightly soluble in alkalis. it is fairly volatile: about half of a sample of it will evaporate within 3 days (unless it is kept in a sealed container). Applications: Polonium was once used in textile mills (to eliminate static charges) and by the manufacturers of photographic plates (in brushes to remove the accumulated dust). It is used as a source of alfa-radiation for research and, alloyed with beryllium it can act as a portable source of neutrons, which normally only access to a nuclear reactor can provide. Polonium in the environment: Polonium is a very rare element in nature. it is found in uranium ores, but none extract it form these ores. Polonium is produced in about 100 g/year by bombarding bismuth with neutrons in a nuclear reactor.

Principal-Only (PO)

Business / Finance / Principal-Only (PO): A mortgage-backed security (MBS) whose holder receives only principal cash flows on the underlying mortgage pool. All the principal distribution due from the underlying collateral pool is paid to the MORE

Polonium (Po)

Science / Periodic Table of Elements / Polonium (Po): Atomic number: 84, Atomic mass: (210) g.mol -1, Electronegativity: 2.0, Density: 9.51 g.cm-3 at 20°C, Melting point: 254 °C, Boiling point: 962 °C, Vanderwaals radius: 0.164 nm, Ionic radius: 0.102 MORE

Links
Home
Glossary
Thesaurus