United Nations Declares 2019 International Year of the Periodic Table
Origins of the periodic table trace back to Dmitri Mendeleev, who organized elements based on chemical behavior. Celebrate the 150th anniversary of this indispensable tool for understanding chemistry.
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United Nations Declares 2019 the International Year of the Periodic Table By Stephen Luntz, 02 JAN 2019
International Year of the Periodic Table Welcome to the UNESCO International Year of the Periodic Table of Elements, celebrating the 150thanniversary of this vital method for understanding chemistry.
International Year of the Periodic Table The origins of the periodic table go back to Dmitri Mendeleev. Faced with the discovery of an ever-increasing number of elements to replace the four known ones in medieval times, it was clear there was a need to find a way to organize them.
International Year of the Periodic Table Mendeleev s structure was based on similarities in chemical behavior. He used to predict the properties of then-unknown elements in the gaps, a tradition many chemists followed. Although the reasons for the table s patterns were then unknown, the recognition of their existence helped lead the way to the explanation in the form or the behavior of elements valence electrons.
Key words: Periodic table of elements periodni sistem elemenata Chemistry hemija Chemical hemijski Chemist hemicar Property osobina Pattern raspored, sara, sablon
