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

(a) Name the elements which have taken the place of these elements.

(b) Mention the group and the period of these elements in the Modern Periodic Table.

(c) Classify these elements as metals, nonmetals or metalloids.

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Solution

(a) Eka-Silicon as germanium and Eka-aluminium as gallium. [1 Mark]

(b) Gallium (Group 13, Period 4) and germanium (Group 14, Period = 4). [1 Mark]

(c) Gallium is a metal and germanium is a metalloid. [1 Mark]

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Similar questions

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?

Q. Mendeleev ′ predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
Classify these elements as metals, non-metals or metalloids

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

Mendeleev predicted the existence of two elements and named then as Eka-silicon and Eka-aluminium.

(a) Name the elements which took over their positions at later stage.

(b) Name the groups to which these elements belong and also give their electronic configuration.

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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(a) Eka-Silicon as germanium and Eka-aluminium as gallium. [1 Mark] (b) Gallium (Group 13, Period 4) and germanium (Group 14, Period = 4). [1 Mark] (c) Gallium is a metal and germanium is a metalloid. [1 Mark]

(a) Eka-Silicon as germanium and Eka-aluminium as gallium. [1 Mark]

(b) Gallium (Group 13, Period 4) and germanium (Group 14, Period = 4). [1 Mark]

(c) Gallium is a metal and germanium is a metalloid. [1 Mark]