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Question 47(d)
Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.

How many valence electrons are present in each one of them?


Solution

Eka-aluminium is galium (Ga) contains 3 valence electrons. Eka-silicon is germanium (Ge) contains 4 valence electrons.

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