Mendeleve predicted the exitence of certain elements not known at that time and named to 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 these elements?

Answer

(a) (i) Gallium, (ii) Germanium, (b) 4th period (c) Gallium ; 13 th group; Germanium; 14 th group (d) Gallium: Meal; Germanium : Metalloid (e) Gallium :3; Gaermaniun: 4

Explanation

NA