The Periodic Table of Chemical Elements is one of the most significant achievements in science, capturing the essence not only of chemistry, but also of physics and biology. 1869 is considered as the year of formulation of the modern concept of the Periodic System by Dmitri Mendeleev (and others). 2019 is the 150th anniversary of this formulation and has therefore been proclaimed the "International Year of the Periodic Table of Chemical Elements (IYPT2019)" by the United Nations General Assembly and UNESCO.
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Georges Edouard Lemaître (1894 - 1966) was a Belgian physicist, astronomer, and Roman Catholic priest. He proposed an expanding universe and is the central founding father of the Big Bang model of the Universe.Immagine: SPS
The Swiss Physical Society (SPS) and SCNAT celebrate the International Year of the Periodic Table of the Elements (IYPT 2019) with a special symposium on Friday, 30 August 2019 in Zurich.Immagine: UNESCO
Il y a 150 ans, le 6 mars 1869, Dmitri Mendeleïev présentait son Tableau périodique devant la société russe de chimie, un outil toujours incontournable pour les chimistes. Des Genevois y ont associé leurs noms par la suite en y ajoutant trois nouveaux éléments.Immagine: Pixabay