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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 ? |
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Answer» (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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