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Especially in the 19th century, the age of exploration, a lot of toponyms got a different name because of national pride. Thus the famous German cartographer Petermann thought that the naming of newly discovered physical features was one of the privileges of a map-editor, especially as he was fed up with forever encountering toponyms like ...
When considering the different locations of the same isotope, the term isotopomer, first proposed by Seeman and Paine in 1992, is used. [4] [5] Isotopomerism is analogous to constitutional isomerism or stereoisomerism of different elements in a structure. Depending on the formula and the symmetry of the structure, there might be several ...
41 of the 118 known elements have names associated with, or specifically named for, places around the world or among astronomical objects. 32 of these have names tied to the places on Earth, and the other nine are named after to Solar System objects: helium for the Sun; tellurium for the Earth; selenium for the Moon; mercury (indirectly), uranium, neptunium and plutonium after their respective ...
Thus element 164 with 7d 10 9s 0 is noted by Fricke et al. to be analogous to palladium with 4d 10 5s 0, and they consider elements 157–172 to have chemical analogies to groups 3–18 (though they are ambivalent on whether elements 165 and 166 are more like group 1 and 2 elements or more like group 11 and 12 elements, respectively). Thus ...
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).
Place-names may also be compounds composed of elements derived from two or more languages from different periods. The majority of the toponyms predate the radical changes in the English language triggered by the Norman Conquest, and some Celtic names even predate the arrival of the Anglo-Saxons in the first millennium AD.
Chloride is an anionic species, and its formula is Cl −. [7] Radical species: Molecules or atoms with unpaired electrons. Triarlborane anion is a radical species and its formula is Ar3B − [8] [9] Chemicals can be two different types of species. For example, nitrate is a molecular and ionic species, with its formula being NO 3 −.
The amounts of total mass in elements heavier than hydrogen and helium (called 'metals' by astrophysicists) remains small (few percent), so that the universe still has approximately the same composition. Stars fuse light elements to heavier ones in their cores, giving off energy in the process known as stellar nucleosynthesis.