How to find covalency of compounds
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Covalency of a element means how many maximum covalent bonds it can form.
The term Covalency is only for smaller elements which can form covalent because the larger elements show variable valency , so for them valency term is replaced by oxidation state or number.
i.e of period 1, 2 of p- block .
B,C,N the Covalency is 4 . Can be seen in compounds like BH4-, CH4, NH4+
For Oxygen Covalency is 3 in O3 .
For Fluorine Covalency is 1 . Etc.
Note : Covalency or valency is used only with period 1 &2 elements of p- block but after that elements can expand its Octet due to d- orbitals.
From third period onwards the term valency or Covalency is replaced by oxidation state or oxidation number.
The term Covalency is only for smaller elements which can form covalent because the larger elements show variable valency , so for them valency term is replaced by oxidation state or number.
i.e of period 1, 2 of p- block .
B,C,N the Covalency is 4 . Can be seen in compounds like BH4-, CH4, NH4+
For Oxygen Covalency is 3 in O3 .
For Fluorine Covalency is 1 . Etc.
Note : Covalency or valency is used only with period 1 &2 elements of p- block but after that elements can expand its Octet due to d- orbitals.
From third period onwards the term valency or Covalency is replaced by oxidation state or oxidation number.
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