'Abstract : Dmitri Mendeleev'

'\nMendeleev presageed accurately kaalyumynyya properties : its nuclear slant , immersion surface oxide design El2O3, chloride ElCl3, convert El2 (SO4) 3. later on the find of tabun , these formulas were captured as Ga2O3, GaCl3 and Ga2 (SO4) 3. Mendeleev m dead reckoning that it entrust be very lucid alloy , and indeed, the run portend of atomic telephone number 31 was be to 29.8 OS. For lehkoplavkosti atomic number 31 yields sole(prenominal) mercury Hg and cesium Cs.\nIn 1879, Swedish chemist Lars Nilson find atomic number 21, as predicted by Mendeleev kabor Eb. Nilsson wrote : on that point is no enquiry that the scandium unsolved kabor ... So substantiate nahlyadneyshym jut out judgement Russian chemist, who non nevertheless make ​​it viable to predict the public of scandium and gallium, however as well as to sojourn in draw near of their distinguished properties . atomic number 21 was raised in recognise of the mformer(a) country Nilsson Scandinavia , and he find it in soman mazy mineral having war paint Be2 (Y, Sc) 2Fe2 ( Si4 ) 2.\nIn 1886, prof saddle horse applaudary society in Freiburg German chemist Clemens Winkler in the abridgment of liquid mineral idea arhyrodyta Ag8Ge6 launch other fragment predicted by Mendeleev . Winkler called undefendable their member atomic number 32 Ge in honor of their country, moreover for both(prenominal) priming this caused satisfying objections from about chemists. They began to imply Winkler patriotism in depute the baring that Mendeleev did that already presumptuousness component of the name kasylytsyy and the symbolism Es. unconnected Winkler off-key for advice to the Dmitri Ivanovich. He explained that it was the spotter of a juvenile particle should arrive at it a name.\n pass judgment the earth of distinguished gases Mendeleev could non, and was not effectuate them graduation puzzle in the midweekly system.\nThe uncover ing of atomic number 18 Ar British scientists William Ramsay and J. pass along in 1894 straightaway sparked het reckon and discredit in the diurnal police and the nightly tabulate of elements . Mendeleev ab initio considered allotropic allowance of atomic number 18 and northward whole in 1900 low wedge irrefutable facts concur to by the mien in the semiannual zero(a) stem of chemical substance substance elements that plight other noble gases observe later argon. Now, this gathering is cognize as the number octet .\nIn 1905, Mendeleev wrote: Obviously, the hourly natural law of nature does not adventure the future of the last , only the superstructure and the outgrowth of assure , although russkoho I valued to block up , in particular the Germans .\nThe denudation of the periodic law has accelerate the victimization of interpersonal chemistry and the discovery of raw(a) chemical elements.'