1 ene 1869 año - Development of the Periodic Table Begins
Descripción:
In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them.
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fecha:
1 ene 1869 año
Ahora mismo
~ 156 years ago