Rhenium
91Rheniumoxid — ist der Name mehrerer chemischer Verbindungen zwischen Rhenium und Sauerstoff: Rhenium(III) oxid, Re2O3 Rhenium(IV) oxid, ReO2 Rhenium(V) oxid, Re2O5 Rhenium(VI) oxid, ReO3 Rhenium(VII) oxid, Re2O7 …
92transition 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 …
93Noble metals — The noble metals including mercury and rhenium together with the non noble metal copper ordered according their position in the periodic table of the elements Noble metals are metals that are resistant to corrosion and oxidation in moist air,… …
94reniu — RÉNIU s.n. (chim.) Metal, asemănător cu platina, întrebuinţat în aliaje speciale. [ niu, pron. nìu; Simb. Re] (din fr. rhénium, germ. Rhenium) Trimis de tavi, 13.09.2007. Sursa: MDN RÉNIU s.n. Element chimic asemănător cu platina şi existând în …
95Boron — (pronEng|ˈbɔərɒn) is a chemical element with atomic number 5 and the chemical symbol B. Boron is a trivalent nonmetallic element which occurs abundantly in the evaporite ores borax and ulexite. Boron is never found as a free element on… …
96Hafnium — lutetium ← hafnium → tantalum Zr ↑ Hf ↓ Rf …
97Osmium — This article is about the chemical element. For other uses, see Osmium (disambiguation). rhenium ← osmium → iridium Ru ↑ Os ↓ Hs …
98Alkoxide — The structure of a typical alkoxide group. An alkoxide is the conjugate base of an alcohol and therefore consists of an organic group bonded to a negatively charged oxygen atom. They can be written as RO−, where R is the organic substituent.… …
99Refractory metals — are a class of metals that are extraordinarily resistant to heat and wear. Refractory metals are said to be poorly resistant to oxidation and corrosion. [UFL EMA 6625: Advanced Metal Processing, Summer 2008, Lecture 09] These properties make them …
100Isotope geochemistry — is an aspect of geology based upon study of the relative and absolute concentrations of the elements and their isotopes in the Earth. Broadly, the field is divided into two branches: stable and radiogenic isotope geochemistry.Lead lead isotope… …
