1.

Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev.

Answer»

Solution :Eka-silicon is identified as germanium (Ge) which is placed in group 4 of Mendeléer.s periodic table. The VALENCY of germanium is 4: so the chemical formula for its CHLORIDE MUST be `GeCI_4`.
Eka-aluminium was later identified as GALLIUM (Ga). It is placed in group 3 of the Mendeléev.s periodic table. Hence the valency of gallium is 3 and the formula of chloride would be `GaCl_3`.


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