1.

What was the position of noble gases in the Mendeleev's periodic table?_x005F_x000D_

A. Noble gases, being very inert, were not necessarily put in the periodic table
B. Noble gases were there in the seventh group
C. Mendeleev divided all elements into 8 groups, so there was no place for noble gases
D. Noble gases were not discovered by that time
Answer» E.


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