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	Johan Gadolin - Wikipedia, the free encyclopedia
		Johan Gadolin (June 5, 1760 — August 15, 1852) was a Finnish chemist, physicist and mineralogist.
		In 1792 Gadolin received a sample of fl, heavy mineral found in a quarry in the Swedish village Ytterby near Stockholm.
		Gadolin became the professor of chemistry at the Royal Academy of Åbo in 1797.
	en.wikipedia.org /wiki/Johan_Gadolin (248 words)

	Gadolin, Johan
		Gadolin's doctoral thesis on the analysis of iron was finished in 1781.
		Gadolin's best known achievement was in 1794 the discovery of yttria which was a new earth (element in oxide form), present in a fl mineral found seven years earlier in Ytterby quarry near Stockholm.
		Gadolin wrote in 1798 "Inledning till Chemien" (Introduction to chemistry) which is considered to be the first antiphlogistonic textbook in Swedish.
	www.euchems.org /Distinguished/18thCentury/gadolin.asp (215 words)

	Johan Gadolin (Site not responding. Last check: 2007-10-31)
		Portrait of Johan Gadolin at the age of 19 when he left Turku to continue his studies at the University of Uppsala.
		It is likely that the above portrait made of Johan Gadolin was used as the model for the bicentennial postage stamp of 1960.
		However, Gadolin no longer looks like he is 19 years old in this modern portrait, nor is he looking at the viewer, but rather over the viewer's left shoulder.
	homepage.mac.com /dtrapp/people/JG.html (151 words)

	39 Yttrium
		They were all obtained, however, by elaborate and laborious fractionation of two mixtures, the "yttria" of Gadolin and the "ceria" of Klaproth, Berzelius, and Hisinger, originally believed by their discoverers to be pure oxides.
		Gadolin found that the "fl stone of Ytterby" was composed of 38% of a new "earth type" ("earths" are compounds of elements, usually oxides).
		Peter B. Dean, and Kirsti I. Dean, "Sir Johan Gadolin of Turku: The Grandfather of Gadolinium." (on-line PDF file).
	elements.vanderkrogt.net /elem/y.html (641 words)

	Gadolinium: named after Finland's most famous chemist -- Wastie and Latief 77 (914): 146 -- The British Journal of ...
		Gadolin was born in Åbo (Turku), the son of a professor
		Gadolin's discovery of yttrium brought him fame in his lifetime.
		Sir Johan Gadolin of Turku; the grandfather of gadolinium.
	bjr.birjournals.org /cgi/content/full/77/914/146 (759 words)

	Chemical Elements \| Gadolinium (Site not responding. Last check: 2007-10-31)
		Gadolinium was named for Finnish chemist Johan Gadolin (1760-1852).
		Gadolin served for many years as professor of chemistry at the University of Åbo in Finland.
		He was the first person to study an unusual fl stone discovered near the town of Ytterby, Sweden, in 1787.
	science.enotes.com /chemical-elements/gadolinium/print (66 words)

	BookRags: Gadolinium Summary
		The discovery of gadolinium began with the work of Johan Gadolin (1760- 1852).
		Gadolin found that ytterite contained about 38% of a new substance.
		In honor of this discovery, ytterite was later renamed gadolinite.
	www.bookrags.com /sciences/sciencehistory/gadolinium-wsd.html (347 words)

	The Periodic Table
		Mendeleev's system had to withstand the impact of the discovery of still additional new elements, for which room might, or might not, be found in the periodic table.
		As far back as 1794 a Finnish chemist, Johan Gadolin (1760-1852), had discovered a new metallic oxide (or earth) in a mineral obtained from the Ytterby quarry near Stockholm, Sweden.
		Gadolin named his oxide yttria after the quarry; fifty years later, it yielded the element yttrium.
	www.3rd1000.com /history/periodic.htm (4069 words)

	Facts about Yttrium
		Yttrium was discovered by Johan Gadolin in 1794 and isolated by Friedrich Wohler in 1828.
		Yttria is the oxide of yttrium and was discovered by Johan Gadolin in 1794.
		The famous Russian Scientist, Dimitri Mendeleev, perceived the correct classification method of "the periodic table" for the 65 elements which were known in his time.
	www.facts-about.org.uk /science-element-yttrium.htm (421 words)

	de Bettencourt-Dias group - History (Site not responding. Last check: 2007-10-31)
		Carl Axel Arrhenius, a Swedish artillery officer and amateur geologist, discovered a new mineral which he called ytterbite, as it was found in Ytterby, Sweden.
		Johan Gadolin analyzed ytterbite,which Anders Gustav Ekeberg called yttria (heavy earth) in 1797, and discovered that it was the oxide of a few so far unknown elements.
		Carl Auer Freiherr von Welsbach separated ‘didymium’ into the two new elements praseodymium (green twin, as its salts have a green tint) and neodymium (new twin).
	www-che.syr.edu /faculty/debettencourtdias_group/f_history.htm (777 words)

	64 Gadolinium
		Gadolinite is named after Johan Gadolin (1760-1852), the second holder of the first chair of chemistry in Finland.
		After the old Royal Academy of Åbo was moved to Helsinki in 1828, this chair became the Chair of Organic Chemistry at the University of Helsinki Click here for this page.
		Later the versions Megalin, Isolin and Gadolin, from Greek, Finnish and Hebrew, respectively, were considered in the family, and the last one was adopted.
	www.vanderkrogt.net /elements/elem/gd.html (547 words)

	Sci-Philately - a Selective History of Science on Stamps
		He measured atomic weights and advanced the idea of radicals, and was the influential author of a textbook and annual reviews of chemical progress.
		Johan Gadolin (1760-1852) was a Finnish chemist who in the late 18th century experimented with a mineral from Ytterby, Sweden, which contained new, uncommon oxides, or "earths." Over the next century other investigators were able to identify more than a dozen unknown elements contained in this rare earth, which were called lanthanides.
		Lecoq de Boisbaudran, himself the discoverer of gallium, named one of the rare earths to honor Gadolin: this was gadolinium.
	ublib.buffalo.edu /libraries/asl/exhibits/stamps/chm1a.html (590 words)

	Nobel Prize in Chemistry 1951 - Presentation Speech
		In 1794, Scheele's friend from his days in Uppsala, the Åbo professor Johan Gadolin published in the proceedings of the Academy of Sciences a report on a "Study of a fl heavy kind of stone from Ytterby Stone Quarry at Roslagen".
		Already Gadolin had reckoned with the possibility that the yttria isolated by him was not a simple substance and it proved indeed later to consist of several oxides.
		Thus, corresponding to the lanthanides, there are the actinides, and a certain agreement can be found member for member between these two series.
	nobelprize.org /nobel_prizes/chemistry/laureates/1951/press.html (1837 words)

	Interactive Periodic Table (Site not responding. Last check: 2007-10-31)
		Yttrium (Ytterby, a Swedish village near Vaxholm) was discovered by Johan Gadolin in 1794 and isolated by Friedrich Wohler in 1828 as an impure extract of yttria through the reduction of yttrium anhydrous chloride (YCl
		) is the oxide of yttrium and was discovered by Johan Gadolin in 1794 in a gadolinite mineral from Ytterby.
		In 1843 Carl Mosander was able to show that yttira could be divided into the oxides (or earths) of three different elements.
	mendeleev-table.com /y.html (320 words)

	June in Chemistry
		Heinrich Otto Wieland born 1877: organic chemistry and biochemistry; Nobel Prize, 1927.
		Johan Gadolin born 1760: discovered yttrium (Y, element 39); gadolinium (Gd, 64) was named after him.
		Benjamin Brodie gave a lecture to the Chemical Society on the "Chemical Calculus", an attempt at a non-atomic theory of chemical composition, 1866.
	web.lemoyne.edu /~giunta/June.html (1570 words)

	It's Elemental - The Element Gadolinium
		Named for the mineral gadolinite which was named after Johan Gadolin, a Finnish chemist.
		Spectroscopic evidence for the existence of gadolinium was first observed by the Swiss chemist Jean Charles Galissard de Marignac in the minerals didymia and gadolinite ((Ce, La, Nd, Y) FeBe
		Gadolinium compounds are used to make phosphors for color televisions.
	education.jlab.org /itselemental/ele064.html (160 words)

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