Which of the following element(s) was/were not known when Mendeleev gave his classification?
A
Germanium
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B
Gallium
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C
Scandium
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D
All of the above
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Solution
The correct option is D All of the above 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.