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

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

Eka-aluminium is

Eka-aluminium is

The correct formula of aluminium oxide is

(a) How do the properties of eka-aluminium element predicted by Mendeleev compare with the actual properties of gallium element? Explain your answer. (b) What names were given by Mendeleev to the then undiscovered elements (i) Scandium (ii) gallium, and (iii) germanium?

Eka aluminium is :

Eka Al and Eka Si predicted by Mendeleev was

(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.