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Q.

The places that were left empty by Mendeleev were for :

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a

gallium and germanium

b

arsenic and antimony 

c

aluminum and silicon 

d

molybdenum and tungsten 

answer is B.

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Detailed Solution

The periodic table created by Mendeleev already had silicon, oxygen, and chlorine. He included provisions for yet-to-be-discovered components. among them are gallium and germanium.

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The places that were left empty by Mendeleev were for :