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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. | |