The main reason for showing anomalous properties of the first member of a group in s or p-block is :

maximum chemical reactivity

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maximum electronegativity and different configurations

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small size, large charge/radius ratio

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tendency to form multiple bonds

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Solution

The correct option is B small size, large charge/radius ratio
The main reason for showing anomalous properties of the first member of a group in s or p-block is small size, large charge/radius ratio. For example, in the first group, Li shows anomalous behavior due to small size, large charge/radius ratio( high polarising power).

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Similar questions

[B F_{4}]^{-}

[A l F_{6}]^{3 -}

s -

p -

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:

The first member of each group of representative elements (i.e., s and p - block elements) shows anomalous behaviour. Illustrate with two examples.

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