The Electronic Theory of Valency.
Electronic Theory of Valency:
G.N. Lewis explained valency, in terms of interaction between extra nuclear electrons of the combining atoms.
It was suggested that during the formation of molecule, the combining atones tend to attain a stable electronic configurations similar to that of inert gases. The inert gases have s2p6 configuration in their outermost shell (expect He, 1s2 ).
According to the electronic theory of valency, when atoms combine to form molecules, the electrons in the outermost shells of the atoms tend to acquire inert gas structure (1s2 or s2p6), which has maximum stability and minimum energy.
Also read | Phosphorus Cycle.
The atoms after bond formation contain eight electrons in ‘their outermost shells. The interaction of extra nuclear electrons leads to the formation of the following types of bonds:
- Electrovalent or ionic bond
- Covalent bond
- Coordinate bond