s-Block ElementsHard

Question

In certain matters, lithium differs from other alkali metals, the main reason for this is :

Options

A.small size of lithium atom and Li+ ion   
B.extremely high electropositivity of Li
C.greater hardness of Li
D.hydration of Li+ ion

Solution

It has highest polarising power among the alkali metals because of small size and thus show different properties than that of other elements of the group.

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