Mendeleev predicted the existence of certain elements not known at that time and named two of
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.
(c) Write the group/groups 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 ?
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(a) (i) Gallium (ii) Germanium.
(b) 4th period .
(c) Gallium: 13th group; Germanium: 14th group .
(d) Gallium: Metal; Germanium: Metalloid .
(e) Gallium: 3 ; Germanium: 4 .
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