Hafnium
91Ununnilium — Dieser Artikel beschäftigt sich mit dem chemischen Element Darmstadtium; für das hiernach benannte Darmstädter Wissenschafts und Kongresszentrum darmstadtium siehe dort. Eigenschaften …
92Гафний — Hf (Hafnium, от позднелат. Hafnia назв. г. Kопенгаген, где был открыт * a. hafnium; н. Hafnium; ф. hafnium; и. hafnio), хим. элемент IV группы периодич. системы Mенделеева, ат. н. 72, ат. м. 178,49. Природный Г. состоит из 6 стабильных… …
93Hafnio — Lutecio ← Hafnio → Tantalio Zr   …
94transition element — Chem. any element in any of the series of elements with atomic numbers 21 29, 39 47, 57 79, and 89 107, that in a given inner orbital has less than a full quota of electrons. Also called transition metal. [1920 25] * * * Any chemical element with …
95ALLIAGES — Les alliages représentent une illustration matérielle du vieux dicton «l’union fait la force». L’homme a toujours cherché des matériaux plus performants à l’utilisation, plus faciles à fabriquer ou à mettre en œuvre et plus économiques. Les… …
96Neptunium — uranium ← neptunium → plutonium Pm ↑ Np ↓ (Uqt) …
97Titanium — This article is about the chemical element. For other uses, see Titanium (disambiguation). scandium ← titanium → vanadium …
98George de Hevesy — The native form of this personal name is Hevesy György. This article uses the Western name order. György Hevesy Born …
99Lanthanide contraction — is a term used in chemistry to describe different but closely related concepts associated with smaller than expected ionic radii of the elements in the lanthanide series (atomic number 58, Cerium to 71, Lutetium).CauseVery simply, the effect… …
100Hot cathode — is also a name for a hot filament ionization gauge, a vacuum measuring device.In vacuum tubes, a hot cathode is a cathode electrode which emits electrons due to thermionic emission. ( Cf. cold cathodes, where field emission is used and which do… …
