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.Continue Reading
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
The components of a nuclear symbol include the symbol of the element, the atomic number of the element, and the mass number of the isotope. Isotopes of a specific element have the same symbol but a different amount of neutrons.Full Answer >
An element's tendency to react is closely related to internal factors such as surface area and particle size. External factors that influence reaction include temperature and pressure.Full Answer >
Each atom contains an equal number of protons and electrons; these particles will be equal in value to an element's atomic number. For example, the element gold, or AU, has an atomic number of 79, meaning it has 79 protons and 79 electrons. Atomic number is not to be confused with atomic mass.Full Answer >
Oxygen has 8 neutrons, 8 electrons and 8 protons, making it a neutral element. Neutral elements have the same number of neutrons and protons. Oxygen is the eighth element in the periodic table of elements, with an atomic number of 8.Full Answer >