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

(i) In Mendeleev's Periodic Table, the elements were arranged in the increasing order of atomic masses. However, cobalt with atomic mass of 58.93 a.m.u. was placed before nickel having an atomic mass of 58.71 a.m.u. Give reason for the same. (ii) Write the formula of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev.

Eka-aluminium is

Eka-aluminium is

The formula of oxides and chloride of Eka-Silicon is

The formula of chloride formed by eka silicon

Eka aluminium is :

The correct formula of the oxide of Eka-aluminium element predicted by Mendeleev was: