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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(a) Name the elements which have taken the place of these elements(b) Mention the group and the period 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.

(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?

Answers (1)

a)
Eka-Silicon---------- Germanium
Eka-aluminum---------- Gallium
b)
Germanium is in group 14, Period 4
Gallium is in group 13, Period 4
c)
Gallium is a Metal
Germanium is Metalloid
d)
Ga lies in group 13 which means it has 3 valence electrons.
Ge lies in group 14 which means it has 4 valence electrons. 

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