According to Chemicool, the element astatine was first produced by Dale R. Coson, Kenneth Ross Mackenzie and Emilio Segrè in 1940. Berta Karlik and Traude Bernert found astatine in nature three years later, according to Chemicool.Know More
Web Elements explains that scientists can produce astatine by bombarding bismuth-209 with alpha particles. Astatine's symbol is "At," its atomic weight is 210 and its atomic number is 85. Astatine-210 is the longest-lived isotope with a half-life of 8.3 hours, according to Web Elements.
Per Chemicool, astatine-211 is useful as a radioactive tracer and in some cancer treatments. It is a radioactive halogen and accumulates in the thyroid in a manner similar to iodine.Learn more about Chemistry
Photochemical smog refers to smog produced when sunlight interacts with molecules of harmful chemicals and pollutants in the Earth's atmosphere. Photochemical smog classifies as air pollution. It exists in areas around the world, and concentrates primarily in the thick airs above cities and major metropolitan regions.Full Answer >
Polypropylene is produced from liquid or gaseous propene, which is derived from gas oil, naphtha, ethane and propane. The process of creating polypropylene from propene is known as polymerization.Full Answer >
A solid precipitate can be produced from the combination of two aqueous, ionic solutions. Whether or not the two solutions form a precipitate for certain can be predicted using a series of rules for the solubility of inorganic compounds. The ions in the two compounds interact with each other, but they must produce a compound that is solid and insoluble for it to be considered a precipitate.Full Answer >
Natural light is produced by natural processes, such as the sun and stars. By contrast, man-made devices, such as flashlights and light bulbs, emit artificial light. All forms of light require the release of energy, and in the natural world, this includes explosions, fires and similar phenomenon.Full Answer >