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Thus, Sm–Nd dating is either insensitive to partitioning of the marker elements during various geologic processes, or such partitioning can well be understood and modeled from the ionic radii of said elements. [118] The Sm 3+ ion is a potential activator for use in warm-white light emitting diodes.
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 ...
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).
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.
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 Pa, an isotope of protactinium. This named isotope later became the official name for element 91. Ra: Radium: 88 ...