1 Jan 1902 Jahr - Changes to the periodic table P2

Beschreibung:

In 1902, Mendeleev wrote those elements should be put in a new group he said this idea was consistent with what Ramsay suggested to him and referred to Errera as to the first person to suggest the idea. Mendeleev himself added these elements to the table as group 0 in 1902, without disturbing the basic concept of the periodic table

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