Question

What is difference between valency and co valency

Answer 1

Covalency

The total number of orbitals available in valence shell is known as covalency whether orbitals are completely filled or empty . For example, the electronic configuration of  Boron (At No 5)  is 1s2 2s2 2p1 . So, there are only two shells. The second shell contains one 2s orbitals and three 2p orbitals resulting total four orbitals in second shell. Therefore, Boron  is restricted to a maximum covalency of 4 since only four (one s and three p) orbitals are available for bonding. 

Valency

The electrons present in the last shell determine the valency of a particular element.

If the number of valence electrons ≤4: valency = number of valence electrons 

If the number of valence electrons >4: valency = 8 - number of valence electrons.



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Answer 2

Heay Genius: -

Here is your answer.

Valency is the combining capacity of an element.
But the covalency is element showing 2 valency.
For example Fe show 2/3.It is covalency.

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