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Contrary to cyclopentadienides of most other lanthanides, in Sm(C 5 H 5) 3 some C 5 H 5 rings bridge each other by forming ring vertexes η 1 or edges η 2 toward another neighboring samarium, thus creating polymeric chains. [24] The chloroderivative Sm(C 5 H 5) 2 Cl has a dimer structure, which is more accurately expressed as (η(5)−C 5 H 5 ...
Contrary to cyclopentadienides of most other lanthanides, in Sm(C 5 H 5) 3 some C 5 H 5 rings bridge each other by forming ring vertexes η 1 or edges η 2 toward another neighboring samarium, thus creating polymeric chains. [41] The chloroderivative Sm(C 5 H 5) 2 Cl has a dimer structure, which is more accurately expressed as (η(5)−C 5 H 5 ...
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 ...
All of the remaining radioisotopes, which range from 129 Sm to 168 Sm, have half-lives that are less than two days, and the majority of these have half-lives that are less than 48 seconds. This element also has twelve known isomers with the most stable being 141m Sm (t 1/2 22.6 minutes), 143m1 Sm (t 1/2 66 seconds) and 139m Sm (t 1/2 10.7 seconds).
Superactinides – Hypothetical series of elements 121 to 157, which includes a predicted "g-block" of the periodic table. Transactinide elements – Elements after the actinides (atomic number greater than 103). Transplutonium elements – Elements with atomic number greater than 94. Transuranium elements – Elements with atomic number ...
In 1902 Bohuslav Brauner suggested that there was a then-unknown element with properties intermediate between those of the known elements neodymium (60) and samarium (62); this was confirmed in 1914 by Henry Moseley, who, having measured the atomic numbers of all the elements then known, found that the element with atomic number 61 was missing ...
Samarium (153 Sm) lexidronam (chemical name Samarium-153-ethylene diamine tetramethylene phosphonate, abbreviated Samarium-153 EDTMP, trade name Quadramet) is a chelated complex of a radioisotope of the element samarium with EDTMP. It is used to treat pain when cancer has spread to the bone. [1] [2]
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.