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07/10/2021 6:27 pm
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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?
1 Answer
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07/10/2021 6:28 pm
(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.