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The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15. The number is sometimes followed by a letter, indicating that components are grouped or matched with each other, e.g. R17A, R17B. The IEEE 315 standard contains a list of Class Designation Letters to use for electrical and electronic ...
118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
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Name given to 230 Th, an isotope of thorium identified in the decay chain of uranium. MsTh 1: Mesothorium 1: 88: Name given at one time to 228 Ra, an isotope of radium. MsTh 2: Mesothorium 2: 89: Name given at one time to 228 Ac, an isotope of actinium. Pa: Protactinium: 91: From the Greek protos and actinium. Name restricted at one time to 231 ...
An alphanumeric outline includes a prefix at the beginning of each topic as a reference aid. The prefix is in the form of Roman numerals for the top level, upper-case letters (in the alphabet of the language being used) for the next level, Arabic numerals for the next level, and then lowercase letters for the next level.
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This is a list of auto parts, which are manufactured components of automobiles. This list reflects both fossil-fueled cars (using internal combustion engines ) and electric vehicles ; the list is not exhaustive.