Melting point 527K. Because of its short life isotopes it is found very rarely in nature. 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. This technology is ancient by modern standards, but the properties are still useful for certain applications. Twenty five isotopes of polonium are known, with atomic masses ranging from 194 to 218. Chemical Characteristics. Polonium-210 is the most readily available. 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. There are around 50 synthetic or artificially made compounds of polonium. Polonium, Po, atomic number 84. The element has 33 radioactive isotopes, including polonium-208 and polonium-210. Twenty five isotopes of polonium are known, with atomic masses ranging from 194 to 218. Its atomic number 84 and its symbol is Po. Polonium, a radioactive, silvery-gray or black metallic element of the oxygen group (Group 16 [VIa] in the periodic table). — In-game description 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. Polonium (atomic number 84, symbol Po) is a radioactive element and a very rare semi-metal. 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-211 atom is the radioactive isotope of polonium with relative atomic mass 210.986637 and half-life of 0.516 s. Polonium-210 is the most readily available. 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 compounds have a wide range of oxidation states: 4, 2, -2. Polonium was discovered by Marie Curie and her husband Pierre Curie in 1898. 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 was discovered by Marie and Pierre Curie through their work on radiation in pitchblende (uranium oxide.) 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