Referat, comentariu, eseu, proiect, lucrare bacalaureat, liceu si facultate
Top referateAdmitereTesteUtileContact
      
    


 


Ultimele referate adaugate

Adauga referat - poti sa ne ajuti cu un referat?

Politica de confidentialitate





Ultimele referate descarcare de pe site
  CREDITUL IPOTECAR PENTRU INVESTITII IMOBILIARE (economie)
  Comertul cu amanuntul (economie)
  IDENTIFICAREA CRIMINALISTICA (drept)
  Mecanismul motor, Biela, organe mobile proiect (diverse)
  O scrisoare pierduta (romana)
  O scrisoare pierduta (romana)
  Ion DRUTA (romana)
  COMPORTAMENT PROSOCIAL-COMPORTAMENT ANTISOCIAL (psihologie)
  COMPORTAMENT PROSOCIAL-COMPORTAMENT ANTISOCIAL (psihologie)
  Starea civila (geografie)
 




Ultimele referate cautate in site
   domnisoara hus
   legume
    istoria unui galban
   metanol
   recapitulare
   profitul
   caract
   comentariu liric
   radiolocatia
   praslea cel voinic si merele da aur
 
despre:
 
Mendeleyev, Dimity Ivanovich (1834-1907), Russian chemist
Colt dreapta
Vizite: ? Nota: ? Ce reprezinta? Intrebari si raspunsuri
 
r3h22hx
Mendeleyev, Dimity Ivanovich (1834-1907), Russian chemist, best known for his development of the periodic table of the properties of the chemical elements. This table displays a periodicity (regular pattern) in the elements' properties when they are arranged according to atomic weight.
Mendeleyev was born in Tobolsk, Siberia. He studied chemistry at the University of St Petersburg, and in 1859 he was sent to study at the University of Heidelberg. There he met the Italian chemist Stanislao Cannizzaro, whose views on atomic weight (see Atom) influenced his thinking. Mendeleyev returned to St Petersburg and became Professor of Chemistry at the Technical Institute in 1863. He became Professor of General Chemistry at the University of St Petersburg in 1866. Mendeleyev was a renowned teacher, and, because no good textbook in chemistry was available, he wrote the two-volume Principles of Chemistry (1868-1870), which became a classic.
During the writing of this book, Mendeleyev tried to classify the elements according to their chemical properties. In 1869 he published his first version of what became known as the periodic table. In 1871 he published an improved version of the periodic table, in which he left gaps for elements that were not yet known. His chart and theories gained increased acceptance when three predicted elements—gallium, germanium, and scandium—were subsequently discovered.



Mendeleyev's investigations also included the study of the chemical theory of solution, the thermal expansion of liquids, and the nature of petroleum. In 1887 he undertook a solo balloon flight to study a solar eclipse.
In 1890 he resigned from the university as a consequence of his progressive political views and his advocacy of social reforms. In 1893 he became director of the Bureau of Weights and Measures in St Petersburg and held this position until his death.


});

Colt dreapta
Creeaza cont
Comentarii:

Nu ai gasit ce cautai? Crezi ca ceva ne lipseste? Lasa-ti comentariul si incercam sa te ajutam.
Esti satisfacut de calitarea acestui referat, eseu, cometariu? Apreciem aprecierile voastre.

Nume (obligatoriu):

Email (obligatoriu, nu va fi publicat):

Site URL (optional):


Comentariile tale: (NO HTML)




Noteaza referatul:
In prezent referatul este notat cu: ? (media unui numar de ? de note primite).

2345678910



 
Copyright© 2005 - 2024 | Trimite referat | Harta site | Adauga in favorite
Colt dreapta