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. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Element Classification: Metal. In the environment, thorium exists in combination with other minerals, such as silica. Isotopes: All of the isotopes of thorium are unstable. 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). It is an alpha emitter that goes through six alpha and four beta decay steps to become the stable isotope Pb-208. 90 Th Thorium 232.0377. 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). The atomic masses range from 223 to 234. Group Number: none. Atomic Number: 90. Atomic structure of Thorium includes atomic number, atomic weight, electron configuration It is three times more abundant than Uranium and can meet the world’s energy demand by being used as fuel in … More than 99% of natural thorium exists in the form of thorium-232. Thorium has been considered a monoisotopic element in the past. Group Name: Actinide. Thorium is a naturally occurring, radioactive substance. Th-232 occurs naturally, with a half-life of 1.41 x 10 10 years.

Thorium-232 is useful in breeder reactors because on capturing slow-moving neutrons it decays into fissionable uranium-233. 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? Atomic Weight: 232.0377. 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. 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). Thorium is a slightly radioactive element discovered by Jons Jacob Berzelius in 1828. Discovered by Berzelius in 1828. 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.