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The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.
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Fermium is produced by the bombardment of lighter actinides with neutrons in a nuclear reactor. Fermium-257 is the heaviest isotope that is obtained via neutron capture, and can only be produced in picogram quantities.
The overlaps get quite close at the point where the d-orbitals enter the picture, [50] and the order can shift slightly with atomic number [51] and atomic charge. [ 52 ] [ h ] Starting from the simplest atom, this lets us build up the periodic table one at a time in order of atomic number, by considering the cases of single atoms.
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Crystal structures of elements at their melting points at atmospheric pressure 1 H 13 K Mg: 2 He * 3 Li 453 K W: 4 Be 1560 K W: 5 B 2349 K β-B: 6 C 3800 K g-C: 7 N 63 K β-N: 8 O 54 K γ-O: 9 F 53 K γ-O: 10 Ne 24 K Cu: 11 Na 370 K W: 12 Mg 923 K Mg: 13 Al 933 K Cu: 14 Si 1687 K d-C: 15 P 883 K b-P: 16 S 393 K β-S: 17 Cl 171 K Cl: 18 Ar 83 K ...
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).
The melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at a standard pressure such as 1 atmosphere or 100 kPa.