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

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.

Arrange the above elements in a decreasing order of their atomic radii.

Mendeleev classified elements in order of increasing

The term periodicity in the properties of element are arranged in the increasing order of their atomic numbers similar elements

(a) In this ladder (Figure) symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic numbers in the periodic table (b) Arrangement them in the order of their group also .