Question

What are the reasons for diff chemical behaviour of 1st member of a group of element in the s and p block compared to that of subsequent members in same group?

Answer 1

The anomalous behaviour of first element of s and p block elements of each group as compared to other group members is due to following reasons: Small size of atom, large charge/radius ratio, high electronegativity and non availability of d-orbitals in their valence shell.

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