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Mendeleev became a professor at the Saint Petersburg Technological Institute and Saint Petersburg State University in 1864, [26] and 1865, respectively. In 1865, he became a Doctor of Science for his dissertation "On the Combinations of Water with Alcohol". He achieved tenure in 1867 at St. Petersburg University and started to teach inorganic chemistry while succeeding Voskresenskii to this post; [26] by 1871, he had transformed Saint Petersburg into an internationally recognized center for chemistry research. If we consider the sublimation enthalpies of TcO 3Cl, ReO 3Cl and BhO 3Cl, the values are 49, 66 and 89kJmol -1 respectively. If one had tried to predict the value for bohrium from those of the other two on the basis of the triad principle, the prediction would have been 83kJmol -1, which is only 6.7% away from the experimental value. Saint-PetersburgState University. "Museum-Archives n.a. Dmitry Mendeleev – Museums – Culture and Sport – University – Saint-Petersburg state university". Eng.spbu.ru. Archived from the original on 15 March 2010 . Retrieved 19 August 2012. Project Silica (2017). Microsoft Research. Available online at: https://www.microsoft.com/en-us/research/project/project-silica/c (accessed March 15, 2020).

Table 1 – Two possible sets of elements in group 3 of the periodic table and the triads formed from the last three elements from each set. Y In another department of physical chemistry, he investigated the expansion of liquids with heat, and devised a formula similar to Gay-Lussac's law of the uniformity of the expansion of gases, while in 1861 he anticipated Thomas Andrews' conception of the critical temperature of gases by defining the absolute boiling-point of a substance as the temperature at which cohesion and heat of vaporization become equal to zero and the liquid changes to vapor, irrespective of the pressure and volume. [52]We must expect the discovery of many yet unknown elements – for example, two elements, analogous to aluminium and silicon, whose atomic weights would be between 65 and 75. John W. Moore; Conrad L. Stanitski; Peter C. Jurs (2007). Chemistry: The Molecular Science, Volume 1. Thomson Brooks/Cole. ISBN 978-0495115984 . Retrieved 6 September 2011. Starobor A. V., Zheleznov D. S., Palashov O. V., Savinkov V. I., Sigaev V. N. (2016). Borogermanate glasses for Faraday isolators at high average power. Opt. Commun. 358, 176–179. 10.1016/j.optcom.2015.09.047 [ CrossRef] [ Google Scholar]

To conclude, the trouble at the high atomic number end of the periodic table has now subsided at least for the time being. The trouble at low atomic numbers, namely hydrogen and helium, is still an open question.Mendeleev was the youngest of 17 siblings, of whom "only 14 stayed alive to be baptized" according to Mendeleev's brother Pavel, meaning the others died soon after their birth. [5] The exact number of Mendeleev's siblings differs among sources and is still a matter of some historical dispute. [23] [b] Unfortunately for the family's financial well-being, his father became blind and lost his teaching position. His mother was forced to work and she restarted her family's abandoned glass factory. At the age of13, after the passing of his father and the destruction of his mother's factory by fire, Mendeleev attended the Gymnasium in Tobolsk. Marshall, James L. Marshall; Marshall, Virginia R. Marshall (2007). "Rediscovery of the elements: The Periodic Table" (PDF). The Hexagon: 23–29 . Retrieved 30 December 2019. Mendeleev was raised as an Orthodox Christian, his mother encouraging him to "patiently search divine and scientific truth". [21] His son would later inform her that he departed from the Church and embraced a form of "romanticized deism". [22] Friedman, Robert M. (2001). The politics of excellence: behind the Nobel Prize in science. New York: Times Books. pp. 32–34. ISBN 978-0716731030. Gribbin, J (2002). The Scientists: A History of Science Told Through the Lives of Its Greatest Inventors. New York: Random House. p.378. Bibcode: 2003shst.book.....G. ISBN 978-0812967883.