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A Climate Data Record (CDR) is a specific definition of a climate data series, developed by the Committee on Climate Data Records from NOAA Operational Satellites of the National Research Council at the request of NOAA in the context of satellite records. [1]
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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). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z).. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
This is a documentation subpage for Template:List of chemical elements. It may contain usage information, categories and other content that is not part of the original template page. Used in article List of chemical elements § List .
The Schedule 1 list is one of three lists. Chemicals which are feasible to use as weapons, and their precursors, but which have legitimate applications as well are listed in Schedule 2 (small-scale applications) and Schedule 3 (large-scale applications). The use of Schedule 1, 2, or 3 chemicals as weapons is banned by the Convention.
The currently accepted names and symbols of the chemical elements are determined by the International Union of Pure and Applied Chemistry (IUPAC), usually following recommendations by the recognized discoverers of each element. However, the names of several elements have been the subject of controversies until IUPAC established an official name.
Transition elements * Elements in groups 3 to 11 or 3 to 12 (the latter making up the d-block) Pnictogens: The elements of group 15: N, P, As, Sb, Bi † Chalcogens: The elements of group 16: O, S, Se, Te, Po † Halogens: The elements of group 17: F, Cl, Br, I, At † Noble gases: The elements of group 18: He, Ne, Ar, Kr, Xe, Rn †