Editing Group 7 element (section)

==== Technetium ====

[[File:Technetium(IV)_oxide.png|thumb|right|Technetium(IV) oxide]]

Technetium's main oxides are [[technetium(IV) oxide]] and [[technetium(VII) oxide]]. Technetium(IV) oxide was first produced in 1949 by electrolyzing a solution of [[ammonium pertechnetate]] under [[ammonium hydroxide]]. It has often been used to separate technetium from [[molybdenum]] and rhenium.<ref name="tc" /><ref name="radio" /><ref name="electro">{{cite journal |author1=L. B. Rogers |title=Electroseparation of Technetium from Rhenium and Molybdenum |journal=Journal of the American Chemical Society |date=1949 |volume=71 |issue=4 |pages=1507–1508 |doi=10.1021/ja01172a520 |language=en}}</ref> More efficient ways are the reduction of ammonium pertechnetate by [[zinc]] metal and [[hydrochloric acid]], [[stannous chloride]], [[hydrazine]], [[hydroxylamine]], [[ascorbic acid]],<ref name="radio">{{cite journal |author1=Edward Anders |title=THE RADIOCHEMISTRY OF TECHNETIUM |url=https://www.osti.gov/biblio/4073069 |website=OSTI.GOV |publisher=U.S. Department of Energy Office of Scientific and Technical Information |access-date=4 November 2022 |page=8 |doi=10.2172/4073069 |date=1960|osti=4073069 }}</ref> by the hydrolysis of [[potassium hexachlorotechnetate]]<ref name="magnet">{{cite journal |author1=C. M. Nelson |author2=G. E. Boyd |author3=Wm. T. Smith Jr. |title=Magnetochemistry of Technetium and Rhenium |journal=Journal of the American Chemical Society |date=1954 |volume=76 |issue=2 |pages=348–352 |doi=10.1021/ja01631a009 |publisher=ACS Publications |language=en}}</ref> or by the decomposition of ammonium pertechnetate at 700&nbsp;°C under an inert atmosphere.<ref name="tc">{{cite book |author1=A. G. Sharpe |author2=H. J. Emeléus |title=Advances in Inorganic Chemistry and Radiochemistry |date=1968 |publisher=Elsevier Science |isbn=9780080578606 |page=21 |url=https://books.google.com/books?id=-SnCsg5jM_kC&pg=PA21}}</ref><ref name="img">{{cite thesis |author1=Bradley Covington Childs |title=Volatile Technetium Oxides: Implications for Nuclear Waste Vitrification |journal=UNLV Theses, Dissertations, Professional Papers, and Capstones |date=2017 |doi=10.34917/10985836}}</ref><ref name="at">{{cite journal |author1=Edward Andrews |title=Technetium and Astatine Chemistry |journal=Annual Review of Nuclear Science |date=1959 |volume=9 |pages=203–220 |doi=10.1146/annurev.ns.09.120159.001223 |publisher=Annual Reviews |language=en|doi-access=free |bibcode=1959ARNPS...9..203A }}</ref> It reacts with oxygen to produce technetium(VII) oxide at 450&nbsp;°C.

Technetium(VII) oxide can be prepared directly by the oxidation of technetium at 450-500&nbsp;°C.<ref>{{cite book|author1=Herrell, A. Y. |author2=Busey, R. H. |author3=Gayer, K. H. | title = Technetium(VII) Oxide, in Inorganic Syntheses| year = 1977 | volume = XVII| pages = 155–158 | isbn = 0-07-044327-0|doi=10.1002/9780470132487.ch41}}</ref> It is a rare example of a molecular binary metal oxide. Other examples are [[ruthenium(VIII) oxide]] and [[osmium(VIII) oxide]]. It adopts a [[centrosymmetric]] corner-shared bi-tetrahedral structure in which the terminal and bridging  Tc&minus;O bonds are 167pm and 184 pm respectively and the Tc&minus;O&minus;Tc angle is 180°.<ref>{{cite journal|last=Krebs|first=Bernt|title = Technetium(VII)-oxid: Ein Übergangsmetalloxid mit Molekülstruktur im festen Zustand| journal = Angewandte Chemie | year = 1969 | volume = 81| issue = 9| pages = 328–329| doi = 10.1002/ange.19690810905|bibcode=1969AngCh..81..328K}}</ref>