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naturally-occurring isotope of polonium and is the most common isotope of polonium. It is also the most easily synthesized polonium isotope. 209Po, which does...

Polonium is a chemical element; it has symbol Po and atomic number 84. A rare and highly radioactive metal (although sometimes classified as a metalloid)...

announced the discovery of element 85 as the beta decay product of radium A (polonium-218), choosing the name "helvetium" (from Helvetia, the Latin name of Switzerland)...

has a half-life of only 3.82 days, which decays by α-emission to yield polonium-218. When radon is heated to 400 °C with fluorine, radon difluoride is formed...

which has a half-life of 1600 years. Radon-222 itself alpha decays to polonium-218 with a half-life of approximately 3.82 days, making it the most stable...

seconds lead-196m2 <1 polonium-192m ~1 radon-210m3 1.04 thorium-219 1.05 polonium-206m2 1.05 radon-210m2 1.06 curium-243m 1.08 actinium-218 1.08 lead-192m2...

Uranium-238 follows a sequence of decay through thorium, radium, radon, polonium, and lead. These are the alpha-emitting isotopes in the sequence. (Because...

particulate radium-series radioactive nuclides. Two of these decay products, polonium-218 and 214, present a significant radiologic hazard. If the gas is inhaled...

elements are less frequently so classified: carbon, aluminium, selenium, polonium and astatine. On a standard periodic table, all eleven elements are in...

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...

precedes actinium (89) and follows a three-element gap of instability after polonium (84) where no nuclides have half-lives of at least four years (the longest-lived...

small but significant amounts of the highly dangerous radioactive isotope polonium-210 were also released. It is estimated that the radiation leak may have...

mode is positron emission to the relatively long-lived alpha emitter, polonium-210. In total, only five isotopes of astatine have half-lives exceeding...

precedes actinium (89) and follows a three-element gap of instability after polonium (84) where no nuclides have half-lives of at least four years (the longest-lived...

paper in which they concluded that it was a new element, which they named "polonium". The other was chemically like barium, and in a December 1898 paper they...

periods 4–6 namely gallium, indium and thallium, tin and lead, bismuth, and polonium; and aluminium, a group 13 metal in period 3. They can be seen at the bottom...

detected what might have been spontaneous fission in polonium. If true, it might preclude the use of polonium in the neutron initiators; if true for plutonium...

precedes actinium (89) and follows a three-element gap of instability after polonium (84) where no nuclides have half-lives of at least four years (the longest-lived...

provide evidence for a young age of the Earth. Gentry noted that the 218 polonium radio halos only formed at temperatures below 300 degrees and were visible...

this series includes the following elements: astatine, bismuth, lead, polonium, protactinium, radium, radon, thallium, and thorium. All of the decay products...