Polonium-211 atom is the radioactive isotope of polonium with relative atomic mass 210.986637 and half-life of 0.516 s. Polonium (atomic number 84, symbol Po) is a radioactive element and a very rare semi-metal. The element has 33 radioactive isotopes, including polonium-208 and polonium-210. There are around 50 synthetic or artificially made compounds of polonium. Polonium was discovered by Marie and Pierre Curie through their work on radiation in pitchblende (uranium oxide.) Isotopes of mass 209 (half-life 103 years) and mass 208 (half-life 2.9 years) can be prepared by alpha, proton, or deuteron bombardment of lead or bismuth in a cyclotron, but these are expensive to produce. Hence Polonium was extracted from the uranium ore and identified solely by its strong radioactivity. Polonium is a radioactive chemical element (atomic number 84) that was discovered in 1898 by Marie Curie, who named the element after her country, Poland. Polonium-210 is the most readily available. Twenty five isotopes of polonium are known, with atomic masses ranging from 194 to 218. Its atomic number 84 and its symbol is Po. Chemical Characteristics. The atomic number of polonium is 84 and atomic mass is 209. Polonium, Po, atomic number 84. Isotopes of mass 209 (half-life 103 years) and mass 208 (half-life 2.9 years) can be prepared by alpha, proton, or deuteron bombardment of lead or bismuth in a cyclotron, but these are expensive to produce. Polonium (Po) is a silvery-gray metal that has the atomic number 84 in the periodic table in Group 16. The first element to be discovered by radiochemical analysis, polonium was discovered in 1898 by Pierre and Marie Curie, who were investigating the radioactivity of a certain pitchblende. It has the symbol Po. Name: Polonium Symbol: Po Atomic Number: 84 Atomic Mass: (209.0) amu Melting Point: 254.0 °C (527.15 K, 489.2 °F) Boiling Point: 962.0 °C (1235.15 K, 1763.6 °F) Number of Protons/Electrons: 84 Number of Neutrons: 125 Classification: Metalloid Crystal Structure: Monoclinic Density @ 293 K: 9.4 g/cm 3 Color: Unknown Atomic Structure It is a scarce element that is produced in nuclear reactors. Polonium-210 is the most readily available. There are very few naturally occurring compounds of polonium. Twenty five isotopes of polonium are known, with atomic masses ranging from 194 to 218. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Because of its short life isotopes it is found very rarely in nature. Melting point 527K. Polonium compounds have a wide range of oxidation states: 4, 2, -2. Polonium, a radioactive, silvery-gray or black metallic element of the oxygen group (Group 16 [VIa] in the periodic table). 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