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

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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Anomalous Properties of Second Period Elements: The anomalous behaviour is because of their small size, large charge/radius ratio, high electronegativity, and non-availability of d-orbitals in their valence shell.

example:

1. Compounds of lithium have significant covalent character. whereas compounds of other alkali metals are predominantly ionic.

2. In p-block elements, the first member of each group has four orbitals: one 2s-orbital and three 2p-orbitals, which are their valence shell. So, these elements show a maximum covalency of four, while other members of the same group or different groups show a maximum covalency beyond four due to the availability of vacant d-orbitals.

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