Heat capacity C has the unit of energy per degree or energy per kelvin. Parallèlement, Jean Charles Galissard de Marignac découvre à Genève que l'erbine n'est pas homogène et il parvient à en extraire un nouvel élément, qu'il nomme ytterbium. By convention, the pressure is assumed to be 1 atm (101.325 kPa) unless otherwise specified. The pressure at which vaporization (boiling) starts to occur for a given temperature is called the saturation pressure. [31], Holmium plays no biological role in humans, but its salts are able to stimulate metabolism. Adding a heat will convert the solid into a liquid with no temperature change. En 1878, le chimiste suisse Marc Delafontaine croit découvrir dans la samarskite un nouvel élément qu'il nomme philippium (symbole Pp), en l'honneur de son bienfaiteur Philippe Plantamour. Le thulium est un élément chimique de symbole Tm et de numéro atomique 69. where X is any atom or molecule capable of being ionized, X+ is that atom or molecule with an electron removed (positive ion), and e− is the removed electron. L'holmium n'a pas de rôle biologique déterminé. The biological effects of holmium over a long period of time are not known. Under trichromatic light, it is fiery orange-red, almost indistinguishable from the appearance of erbium oxide under the same lighting conditions. Some vegetables have had their holmium content measured, and it amounted to 100 parts per trillion. In other words, it can be expressed as the neutral atom’s likelihood of gaining an electron. L'holmium ne possède qu'un isotope stable, 165Ho. The element has been isolated through the reduction of its anhydrous chloride or fluoride with metallic calcium. En 1879, il obtient trois fractions distinctes qu'il soumet à un examen spectroscopique. He would have seen x-ray emission lines for both elements, but assumed that the dominant ones belonged to holmium, instead of the dysprosium impurity. Holmium obeys the Oddo–Harkins rule: as an odd-numbered element, it is less abundant than its immediate even-numbered neighbors, dysprosium and erbium. Cette protection a cependant l'inconvénient de rendre difficile la lecture de l'information stockée, Beatriz Cordero, Verónica Gómez, Ana E. Platero-Prats, Marc Revés, Jorge Echeverría, Eduard Cremades, Flavia Barragán et Santiago Alvarez, Base de données Chemical Abstracts interrogée via SciFinder Web le 15 décembre 2009 (, Entrée « Holmium, powder » dans la base de données de produits chimiques, http://minerals.usgs.gov/minerals/pubs/commodity/rare_earths/740798.pdf, https://fr.wikipedia.org/w/index.php?title=Holmium&oldid=170110014, licence Creative Commons attribution, partage dans les mêmes conditions, comment citer les auteurs et mentionner la licence, Diagrammes des découvertes des terres rares. Découvrez-en plus sur ses propriétés chimiques et physiques, ses états, son énergie, ses électrons, son oxydation et plus. Latent Heat of Fusion of Holmium is 12.2 kJ/mol. Les dates entre parenthèses sont les dates d'annonces des découvertes. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. C'est ainsi que erbia (l'erbine) finit par désigner l'oxyde d'erbium (rose) et terbia (la terbine) l'oxyde de terbium (jaune)[10].
Les ions de l'holmium en solution aqueuse. Il s'oxyde peu dans l'air sec. Holmium (Holmia, Latin name for Stockholm) was discovered by Jacques-Louis Soret and Marc Delafontaine in 1878 who noticed the aberrant spectrographic absorption bands of the then-unknown element (they called it "Element X").
Note that, these points are associated with the standard atmospheric pressure. [24] Since it can absorb nuclear fission-bred neutrons, it is also used as a burnable poison to regulate nuclear reactors.
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