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Variation of Valency

d Mendeleev p...

Question

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?

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Solution

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

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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?

Q. Question 47(a)
Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-Silicon and Eka-Aluminium.

Name the elements which have taken the place of these elements.

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

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

Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-Silicon and Eka-Aluminium.
What is the group and the period of these elements in the Modern Periodic Table.

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Variation of Valency

Standard X Chemistry

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