Atomic Number: 90. However, owing to significant abundance of its minor isotope 232 Th in deep-seawater, in 2013, the Commission recognized thorium as an element with two naturally-occurring isotopes and recommended A r (Th) = 232.0377(4). Thorium-232 is useful in breeder reactors because on capturing slow-moving neutrons it decays into fissionable uranium-233. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Isotopes: All of the isotopes of thorium are unstable. Phase at Room Temperature: Solid. 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. Thorium —(Thor, Scandinavian god of war), Th; atomic weight 232.0381; atomic number 90; melting point 1750°C; boiling point ~4790°C; specific gravity 11.72; valence +2, +3, +4.. Period Number: 7. Atomic structure of Thorium includes atomic number, atomic weight, electron configuration

More than 99% of natural thorium exists in the form of thorium-232. Element Classification: Metal. In the environment, thorium exists in combination with other minerals, such as silica. 90 Th Thorium 232.0377. Th-232 occurs naturally, with a half-life of 1.41 x 10 10 years. Synthetic isotopes have been prepared; thorium-229 (7,880-year half-life), formed in the decay chain originating in the synthetic actinoid element neptunium, serves as a tracer for ordinary thorium (thorium-232). Group Number: none. It is three times more abundant than Uranium and can meet the world’s energy demand by being used as fuel in … Group Name: Actinide. Melting Point: 2023 K (1750°C or 3182°F) Boiling Point: 5061 K (4788°C or 8650°F) Density: 11.72 grams per cubic centimeter. Thorium is a slightly radioactive element discovered by Jons Jacob Berzelius in 1828. The atomic masses range from 223 to 234. Atomic Weight: 232.0377. It is an alpha emitter that goes through six alpha and four beta decay steps to become the stable isotope Pb-208. Thorium is a naturally occurring, radioactive substance. Small amounts of thorium are present in all rocks, soil, water, plants, and animals.Soil contains an average of about 6 parts of thorium per million parts of soil (6 ppm). Discovered by Berzelius in 1828. If a nucleus of thorium-232 (atomic number 90, mass number 232) emits 6 alpha particles and 4 beta particles during its radioactive decay into a stable daughter, what are the atomic number and mass number of the stable daughter? Thorium has been considered a monoisotopic element in the past.

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