Q. 474.8( 4 Votes )

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, non-metals or metalloids

(d) How many valence electrons are present in each one of them?

Answer :

(a) The two elements that have taken the place of Eka-silicon and Eka-aluminium are Germanium (Ge) and Gallium (Ga), respectively.


(b) Germanium is placed in Group 14 and Period 4 in the Modern Periodic Table.


Gallium is placed in Group 13 and Period 4 in the Modern Periodic Table.


(c) Germanium (Ge) is metalloid. Gallium (Ga) is a metal.


(d) Valence electrons in Germanium (Ge) are 4. Valence electrons in Gallium (Ga) are 3.


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