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Iodine-125 (125 I) is a radioisotope of iodine which has uses in biological assays, nuclear medicine imaging and in radiation therapy as brachytherapy to treat a number of conditions, including prostate cancer, uveal melanomas, and brain tumors. It is the second longest-lived radioisotope of iodine, after iodine-129.
Antimony is used in antifriction alloys (such as Babbitt metal), [81] in bullets and lead shot, electrical cable sheathing, type metal (for example, for linotype printing machines [82]), solder (some "lead-free" solders contain 5% Sb), [83] in pewter, [84] and in hardening alloys with low tin content in the manufacturing of organ pipes.
This is an accepted version of this page This is the latest accepted revision, reviewed on 22 February 2025. Periodic table of the elements with eight or more periods Extended periodic table Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium ...
There are 37 artificial radioactive isotopes, the longest-lived of which are 125 Sb, with a half-life of 2.75856 years; 124 Sb, with half-life 60.2 days; and 126 Sb, with half-life 12.35 days. All other isotopes have half-lives less than 4 days, most less than an hour.
George de Hevesy won the 1943 Nobel Prize for Chemistry "for his work on the use of isotopes as tracers in the study of chemical processes". There are two main ways in which radioactive tracers are used When a labeled chemical compound undergoes chemical reactions one or more of the products will contain the radioactive label.
It can be made by reacting phosgene with ethanol, producing hydrogen chloride as a byproduct. Because chloroform can react with oxygen to form phosgene, chloroform can be stabilized for storage by adding 1 part (by mass) of ethanol to 100 parts (by mass) of chloroform, so that any phosgene that forms is converted into diethyl carbonate.
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Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...