Cleve, Per Teodor

Cleve, Per Teodor

▪ Swedish chemist
born Feb. 10, 1840, Stockholm, Swed.
died June 18, 1905, Uppsala

      Swedish chemist who discovered the elements holmium and thulium.

      Cleve became assistant professor of chemistry at the University of Uppsala in 1868 and in addition taught at the Technological Institute in Stockholm from 1870 to 1874. He then was appointed professor of general and agricultural chemistry at Uppsala.

      After extensive chemical investigations, Cleve concluded in 1874 that the element didymium was actually two elements. His theory was vindicated 11 years later by C.A. Welsbach's discovery of neodymium and praseodymium. In 1879 Cleve showed that the newly discovered scandium was the element previously predicted by D.I. Mendeleyev, who called it eka-boron. In that same year Cleve discovered the rare-earth elements holmium and thulium. His contributions to organic chemistry include the discovery of 6 of the 10 possible forms of dichloro naphthalene and the discovery of the aminonaphthalenesulfonic acids, sometimes known as Cleve's acids.

      From 1890 Cleve concentrated on biological studies, notably on freshwater algae, plankton, and diatoms. He developed a method of determining the age and order of late glacial and postglacial deposits from the types of diatom fossils in the deposits. This use of diatoms for identification has also been applied to determining the origin of ocean streams, and Cleve's work on diatoms, The Seasonal Distribution of Atlantic Plankton Organisms (1900), became a basic text on oceanography.

* * *


Universalium. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Cleve, Per Teodor — Cleve , Per Teodor …   Scientists

  • Cleve , Per Teodor — (1840–1905) Swedish chemist Cleve, who was born in the Swedish capital Stockholm, became assistant professor of chemistry at the University of Uppsala in 1868 and was later made professor of general and agricultural chemistry there. He is mainly… …   Scientists

  • Per Teodor Cleve — Saltar a navegación, búsqueda Per Teodor Cleve Per Teodor Cleve (Estocolmo, 10 de febrero de 1840 Uppsala 18 de junio de 1905) fue un químico y geólogo sueco. Después de graduarse en el Gymnasium en Estocolmo 1858, Cleve se matriculó en la …   Wikipedia Español

  • Per Teodor Cleve — (* 10. Februar 1840 in Stockholm; † 18. Juni 1905 in Uppsala) war ein schwedischer Naturforscher und Professor. Inhaltsverzeichnis 1 …   Deutsch Wikipedia

  • Per Teodor Cleve — Pour les articles homonymes, voir Cleve. Per Teodor Cleve Naissance 10 février 1840 Stockholm (Suède) Décès 18 …   Wikipédia en Français

  • Per Teodor Cleve — (Stockholm February 10, 1840 ndash; Uppsala June 18, 1905) was a Swedish chemist and geologist.After graduating from the Stockholm Gymnasium in 1858, Cleve matriculated at the University of Uppsala in May 1858, where he received his Ph.D. in 1863 …   Wikipedia

  • Per Theodor Cleve — Per Teodor Cleve Per Teodor Cleve (* 10. Februar 1840 in Stockholm; † 18. Juni 1905 in Uppsala) war ein schwedischer Naturforscher und Professor. Inhaltsverzeichnis 1 …   Deutsch Wikipedia

  • Per Theodor Cleve — Pour les articles homonymes, voir Cleve. Per Theodor Cleve. Per Teodor Cleve (Stockholm 10 février 1840 – Uppsala 18 juin …   Wikipédia en Français

  • Per Thodor Cleve — Per Theodor Cleve Pour les articles homonymes, voir Cleve. Per Theodor Cleve. Per Teodor Cleve (Stockholm 10 février 1840 – Uppsala 18 juin …   Wikipédia en Français

  • Per Theodor — Cleve Pour les articles homonymes, voir Cleve. Per Theodor Cleve. Per Teodor Cleve (Stockholm 10 février 1840 – Uppsala 18 juin …   Wikipédia en Français

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”