Mendeleev predicted the existence of certain elements not known at that time and named as Eka-aluminiumT he elements which have taken the place of Eka-aluminium is :

Germanium

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Gallium

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Silicon

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Aluminium

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Solution

The correct option is B Gallium
Eka-silicon means germanium. It occurred because of silicon whereas eka-aluminium occurred because of aluminium and later named it gallium.

While filling the elements considering atomic number would be main and fundamental property there were gaps in the mentioned groups hence he filled them with these names.

Hence the correct option is $B$ .

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Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.

(a) Name the element which has taken the place of (i) eka-aluminium and (ii) eka-silicon

(b) Mention the period/periods of these elements in the modern periodic table.

(d) Classify these elements as metals, non-metals or metalloids.

(e) How many valence electrons are present in the atoms of each of these elements?

Eka aluminium predicted by Mendeleev is which element?

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