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Mendeleev predicted the existence of cer...

Mendeleev predicted the existence of certain elements not know at that time. He named two of these elements as eka-aluminium and eka-silicon.
a. Name the elements which have taken the place of these elements.
b. Mention the group and period of these elements in the modern periodic table.
c. Which one of these two elements is a metalloid?
d. How many valence electrons are present in eka-silicon?
e. Eka-aluminium forms a chloride. What is its formula?

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