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.

(b) Gallium (Group 13, Period 4) and Germanium (Group 14, Period = 4).

(c)Gallium is a metal and Germanium is a Metalloid.

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(a) Eka-Silicon as Germanium and Eka-aluminium as Gallium. (b) Gallium (Group 13, Period 4) and Germanium (Group 14, Period = 4). (c)Gallium is a metal and Germanium is a Metalloid.

(a) Eka-Silicon as Germanium and Eka-aluminium as Gallium.

(b) Gallium (Group 13, Period 4) and Germanium (Group 14, Period = 4).

(c)Gallium is a metal and Germanium is a Metalloid.