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?

Eka-aluminium is galium (Ga) contains 1 valence electrons
Eka-silicon is germanium (Ge) contains 2 valence electrons

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

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Eka-aluminium is galium (Ga) contains 4 valence electrons
Eka-silicon is germanium (Ge) contains 5 valence electrons

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Eka-aluminium is galium (Ga) contains 5 valence electrons
Eka-silicon is germanium (Ge) contains 6 valence electrons

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Solution

The correct option is B
Eka-aluminium is galium (Ga) contains 3 valence electrons
Eka-silicon is germanium (Ge) contains 4 valence electrons

Eka-aluminium is gallium (Ga) contains 3 valence electrons (it comes above aluminum and the valency of aluminum is 3 thus it is same for gallium as they belong to the same group)
Eka-silicon is germanium (Ge) contains 4 valence electrons(it comes above aluminum and the valency of aluminum is 4 thus it is same for gallium as they belong to the same group)

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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 and Eka silicon are known as

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