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118 chemical elements are known to exist. All elements to element 94 are found in nature, and the remainder of the discovered elements are artificially produced, with isotopes all known to be highly radioactive with relatively short half-lives (see below). The elements in this list are ordered according to the lifetime of their most stable ...
In chemistry, chemical stability is the thermodynamic stability of a chemical system, in particular a chemical compound or a polymer. [ 1 ] Thermodynamic stability occurs when a system is in its lowest energy state , or in chemical equilibrium with its environment.
The name DuPhos is derived from the chemical company that developed this type of ligand (DuP, DuPont) and the compound class of phospholanes (Phos) it belongs to. FOOF: Dioxygen difluoride, O 2 F 2, an extremely unstable compound which reacts explosively with most other substances – the nickname "FOOF" is a play on its formula. [47] Furfuryl ...
More than 2400 radionuclides have half-lives less than 60 minutes. Most of those are only produced artificially, and have very short half-lives. For comparison, there are about 251 stable nuclides. All chemical elements can exist as radionuclides. Even the lightest element, hydrogen, has a well-known radionuclide, tritium.
Most chemical reactions take more than one elementary step to complete, and a reactive intermediate is a high-energy, hence unstable, product that exists only in one of the intermediate steps. The series of steps together make a reaction mechanism .
Pentaoxidane is an inorganic compound of hydrogen and oxygen with the chemical formula H 2 O 5. [1] This is one of the most unstable hydrogen polyoxides . [ 2 ] [ 3 ] [ 4 ]
40 C.F.R.: Appendix A to Part 355—The List of Extremely Hazardous Substances and Their Threshold Planning Quantities (PDF) (July 1, 2008 ed.), Government Printing Office, archived from the original (PDF) on 2012-02-25
Thioacetone is an organosulfur compound belonging to the -thione group called thioketones with a chemical formula (CH 3) 2 CS. It is an unstable orange or brown substance that can be isolated only at low temperatures. [3] Above −20 °C (−4 °F), thioacetone readily converts to a polymer and a trimer, trithioacetone. [4]