Perekhidni metaly: Zoloto, Kobalt, Mid, Nikel, Rtut, Tsynk, Tantal, Resursy i zapasy zolota, Midni rudy, Zolota moneta, Zolotyy standart (Ukrainian Edition)

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9781233854110: Perekhidni metaly: Zoloto, Kobalt, Mid, Nikel, Rtut, Tsynk, Tantal, Resursy i zapasy zolota, Midni rudy, Zolota moneta, Zolotyy standart (Ukrainian Edition)
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Dzherelo: Wikipedia. Storinky: 35. Hlavy: Zoloto, Kobalʹt, Midʹ, Nikelʹ, Rtutʹ, Tsynk, Tantal, Resursy i zapasy zolota, Midni rudy, Zolota moneta, Zolotyy̆ standart, Midna promyslovistʹ, Susalʹne zoloto, Samorodne zoloto, Resursy i zapasy midi, Kolir zolota, Samorodna midʹ, Konfiskatsiya zolota v naselennya SSHA, Dymetylrtutʹ, Zolotyy̆ zapas rumunsʹkoho korolivstva, Rtutʹ samorodna, Samorodok, Elektrum, Midysti piskovyky i slantsi, Zolotyy̆ zapas Ukraïny, Midno-molibdenovi rudy, Zolotyy̆ zhuk, Karat, Dublon, Fay̆nshtey̆n, Zolotovalyutnyy̆ standart, Proba zolota. Vytyah: Tantal - khimichnyy̆ element iz symvolom Ta ta poryadkovym nomerom 73. Ridkisnyy̆, tverdyy̆, vazhkyy̆, siruvato-holubuvatyy̆ na zrizi, blyskotlyvyy̆ perekhidnyy̆ metal, maye duzhe vysoku stiy̆kistʹ do koroziï. U pryrodi traplyayetʹsya u minerali tantalit i deyakykh inshykh, ale zavzhdy razom iz khimichno blyzʹkym niobiyem. Nalezhytʹ do hrupy metaliv, shcho shyroko zastosovuyutʹsya yak lihatura. Khimichna stiy̆kistʹ tantalu robytʹ y̆oho hidnym materialom dlya vyhotovlennya khimichnoho spetsialʹnoho obladnannya ta zaminy bilʹsh dorohoï platyny. Ale y̆oho nay̆bilʹshe vykorystannya sʹohodni - tse vyhotovlennya tantalovykh elektrolitychnykh kondensatoriv dlya elektroniky. Tantal bulo vidkryto u Shvetsiï u 1802 rotsi Andersom Hustafom Ekeberhom. Rokom ranishe, Charlʹz Hatchet vidkryv element Kolumbiy̆. U 1809 rotsi, anhliy̆sʹkyy̆ khimik Vilʹyam Volaston porivnyav vlastyvosti «zemelʹ» (oksydiv) otrymanykh z kolumbitu, sho mav hustynu 5.918 g/cm, ta tantalitu, shcho mav hustynu 7.935 g/cm, ta zrobyv vysnovok, shcho nezvazhayuchy na velyku riznytsyu u hustyni, vony khimichno identychni. Vin zaproponuvav vse zh zalyshyty im'ya «Tantal». Piznishe Fridrikh Veler pidtverdyv y̆oho rezulʹtat, vin buv vpevnenyy̆ shcho kolumbiy̆ ta tantal tse te same. Tsey̆ vysnovok buv postavlenyy̆ pid sumniv u 1846 nimetsʹkym khimikom Henrikhom Roze, yakiy̆ doviv, shcho u tantaliti mistytʹsya 2 okremykh elementy, ta vin naz...

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