In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.

(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.

Mendeleev arranged elements in the increasing order of their atomic masses. True/False

In the modern periodic table, why does cobalt having higher atomic mass of 58.93 appear before nickel having atomic mass of 58.71?

Mendeleev's periodic table helped in correct determination of atomic masses of elements