which elements group was not known at the time of mendeleev
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Explanation:
geranium, gallium and scandium
The elements which were unknown when Mendeleev gave his classification were geranium, gallium and scandium. He left gaps for the unknown elements and predicted correctly the properties of some of the unknown elements.
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Explanation:
The group 13 was not known at the time when mendeleev gave is periodic table.
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