Polonium (Po) is a silvery-gray metal that has the atomic number 84 in the periodic table in Group 16. Polonium compounds have a wide range of oxidation states: 4, 2, -2. The element has 33 radioactive isotopes, including polonium-208 and polonium-210. Polonium-211 atom is the radioactive isotope of polonium with relative atomic mass 210.986637 and half-life of 0.516 s. Polonium was discovered by Marie Curie and her husband Pierre Curie in 1898. Polonium was discovered by Marie and Pierre Curie through their work on radiation in pitchblende (uranium oxide.) Polonium (atomic number 84, symbol Po) is a radioactive element and a very rare semi-metal. Melting point 527K. 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. 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. Twenty five isotopes of polonium are known, with atomic masses ranging from 194 to 218. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. It is a scarce element that is produced in nuclear reactors. Twenty five isotopes of polonium are known, with atomic masses ranging from 194 to 218. Hence Polonium was extracted from the uranium ore and identified solely by its strong radioactivity. Its atomic number 84 and its symbol is Po. There are very few naturally occurring compounds of polonium. — In-game description There are around 50 synthetic or artificially made compounds of polonium. Chemical Characteristics. 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. The atomic number of polonium is 84 and atomic mass is 209. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. 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 Polonium is an intense source of alpha particles and in sufficient quantities will generate enough heat for radioisotope thermoelectric generators. It has the symbol Po. Polonium, Po, atomic number 84. Polonium, a radioactive, silvery-gray or black metallic element of the oxygen group (Group 16 [VIa] in the periodic table). Polonium-210 is the most readily available. Polonium-210 is the most readily available. This technology is ancient by modern standards, but the properties are still useful for certain applications. 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