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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 ...
Periodic table of the chemical elements showing the most or more commonly named sets of elements (in periodic tables), and a traditional dividing line between metals and nonmetals. The f-block actually fits between groups 2 and 3 ; it is usually shown at the foot of the table to save horizontal space.
In the following table, ... (at m.p.) 19 g/cm 3: 78 Pt platinum; use: ... Section 4, Properties of the Elements and Inorganic Compounds; Physical Constants of ...
As in most transuranic elements, nuclear fission cross section is especially high for the odd-mass curium isotopes 243 Cm, 245 Cm and 247 Cm. These can be used in thermal-neutron reactors , whereas a mixture of curium isotopes is only suitable for fast breeder reactors since the even-mass isotopes are not fissile in a thermal reactor and ...
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.
The Americas, as the element was first synthesised on the continent, by analogy with europium: 96: Cm: Curium: Pierre Curie and Marie Curie, French physicists and chemists 97: Bk: Berkelium: Berkeley, California, where the element was first synthesised, by analogy with terbium: 98: Cf: Californium: California, where the element was first ...
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Here [Ne] refers to the core electrons which are the same as for the element neon (Ne), the last noble gas before phosphorus in the periodic table. The valence electrons (here 3s 2 3p 3) are written explicitly for all atoms. Electron configurations of elements beyond hassium (element 108) have never been measured; predictions are used below.