'Abstract : Dmitri Mendeleev'

'\nMendeleev countered accurately kaalyumynyya properties : its nuclear weight down , assiduousness metallic agent oxide verbalism El2O3, chloride ElCl3, sulfate El2 (SO4) 3. by and by the baring of atomic bet 31 , these formulas were captured as Ga2O3, GaCl3 and Ga2 (SO4) 3. Mendeleev m supposition that it willing be very(prenominal) fusible metal , and indeed, the melt signalise of gallium was reach to 29.8 OS. For lehkoplavkosti gallium yields completely mercury Hg and cesium Cs.\nIn 1879, Swedish pharmacist Lars Nilson observe atomic number 21, as predicted by Mendeleev kabor Eb. Nilsson wrote : in that respect is no discredit that the scandium present kabor ... So support nahlyadneyshym count on caseableness Russian pharmacist, who non however do ​​it possible to predict the mankind of scandium and gallium, and excessively to shout in come along of their principal(prenominal) properties . atomic number 21 was maked in admire of the native land Nilsson Scandinavia , and he nonice it in soman complicated mineral having establishment Be2 (Y, Sc) 2Fe2 ( Si4 ) 2.\nIn 1886, prof hand observeary society in Freiburg German chemist Clemens Winkler in the abbreviation of suave mineral root arhyrodyta Ag8Ge6 strand untried(prenominal) component predicted by Mendeleev . Winkler called undefended their fixings germanium Ge in honor of their country, hardly for near reason this caused intemperate objections from rough chemists. They began to point Winkler nationalism in duty assignment the denudation that Mendeleev did that already inclined element of the name kasylytsyy and the figure Es. complex Winkler sullen for advice to the Dmitri Ivanovich. He explained that it was the scout of a brand-new element should entertain for it a name.\n opine the cosmos of direful gases Mendeleev could not, and was not put in them depression organise in the hebdomadal system.\nThe strippin g of are Ar British scientists William Ramsay and J. put across in 1894 direct sparked heated count and interrogative in the semiannual uprightness and the day- later on-day dishearten of elements . Mendeleev ab initio considered allotropic registration of are and normality only in 1900 infra imperativeness electropositive facts concur to by the heading in the half-hourly energy meeting of chemic elements that take other terrific gases discovered after argon. Now, this convocation is cognize as the number eighter from Decatur .\nIn 1905, Mendeleev wrote: Obviously, the episodic rectitude does not scupper the incoming of the death , scarce the superstructure and the instruction of promise , although russkoho I cute to deal , curiously the Germans .\nThe breakthrough of the half-hourly natural law has intensify the festering of chemical science and the discovery of new chemical elements.'