• compounds
  • Most polonides decompose upon heating to about 600 °C, except for HgPo that decomposes at ~300 °C and the lanthanide polonides, which do not decompose but melt at temperatures above 1000 °C. For example, PrPo melts at 1250 °C and TmPo at 2200 °C. PbPo is one of the very few naturally occurring polonium compounds, as polonium alpha decays to form lead. (wikipedia.org)
  • radioactivity
  • Tellurium often has unpleasant effects (although some organisms can use it), and polonium is always extremely harmful, both in its chemical toxicity and its radioactivity. (wikipedia.org)
  • Polonium was discovered in 1898 by Marie and Pierre Curie, when it was extracted from uranium ore and identified solely by its strong radioactivity: it was the first element to be so discovered. (wikipedia.org)
  • Polonium has few applications, and those are related to its radioactivity: heaters in space probes, antistatic devices, and sources of neutrons and alpha particles. (wikipedia.org)
  • They predominantly emit α-particles, and the heat released in this process can serve as a heat source in radioisotope thermoelectric generators, but this application is hindered by the scarcity, high cost, and radioactivity of curium isotopes. (wikipedia.org)
  • calcium
  • There is no widely recognized deficiency syndrome for selenium, unlike the syndromes associated with calcium or magnesium (hypocalcemia and hypomagnesemia, respectively). (encyclopedia.com)
  • important
  • Selenium is also considered an important component in naturopathic life extension (longevity) diets , because of its role in tissue repair and maintaining the youthful elasticity of skin. (encyclopedia.com)
  • natural
  • Due to the short half-life of all its isotopes, its natural occurrence is limited to tiny traces of the fleeting polonium-210 (with a half-life of 138 days) in uranium ores, as it is the penultimate daughter of natural uranium-238. (wikipedia.org)
  • water
  • Selenium is also present in drinking water in some parts of the world and can be added to drinking water as a health measure. (encyclopedia.com)
  • variety
  • Selenium currently has a variety of applications, ranging from standard external preparations for skin problems to experimental and theoretical applications in nutrition and internal medicine. (encyclopedia.com)