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Alchemical Symbols is a Unicode block containing symbols for chemicals and substances used in ancient and medieval alchemy texts. Many of the symbols are duplicates or redundant with previous characters.
Computer Modern is a "Didone", or modern serif font, a genre that emerged in the late 18th century as a contrast to the more organic designs that preceded them. Didone fonts have high contrast between thick and thin elements, and their axis of "stress" or thickening is perfectly vertical.
The main group elements are the elements of groups 1, 2, and 13–18 (i.e. the s-block and p-block). [5] The transition elements are the elements of groups 3–12 (i.e. the d-block) – this in particular includes group 12 (although some sources do not include it). [5] The inner transition elements are f-block elements. [2]
Also used for the element praseodymium: see above) R: In organic chemistry contexts, an unspecified "R" is often understood to be an alkyl group; Tf: triflyl (trifluoromethanesulfonyl) Tr, Trt: trityl (triphenylmethyl) Ts, Tos: tosyl (para-toluenesulfonyl) – (Ts also used for the element tennessine: see above) Vi: vinyl
These elements originally referred to earth, water, air and fire rather than the chemical elements of modern science. The term 'elements' (stoicheia) was first used by Greek philosopher Plato around 360 BCE in his dialogue Timaeus, which includes a discussion of the composition of inorganic and organic bodies and is a speculative treatise on ...
classes of organic compounds (including many biochemicals): steroids, aldohexoses, terpenes; classes of inorganic and coordination compounds: metal oxo compounds, metal carbonyl compounds, metal clusters; elements are handled under a separate Wikiproject with guidelines, see Wikipedia:WikiProject Elements/Guidelines
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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 ...
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