Trick To Find Valency of an Element

Let’s Learn to calculate the Valency of an element quickly By using this Trick

Trick To Find Valency of an Element:

 

Conditions for this trick to apply,

1. You must know the Valence Electron of that Element.
2. This trick is only suitable for S & P block elements
3. It won’t applicable for D block elements due to their variable Oxidation states.
4. Lower P block elements do not come under this trick because they’ll possess an Inert Pair Effect  Eg:  Lead, Tin, etc
5. Noble Gases don’t have any valency due to their octet stability (Outer Orbital Filled with Electrons)

Let’s look at the trick to find the valency of an element. There are two formulae to calculate the Valency of elements.

 

• If Valence Electron is Equal to 1,2,3,4 then the Valency of the Element is also the same as the valence electron.

Eg: Carbon valence electron is

Carbon Electronic configuration – 1s²,2s²2p², then valence is 4

Therefore the Valency of Carbon is FOUR

 

• If the Valence Electron is more than 4,5,6,7 then the Valency of the Element is  (8 – Valence Electron)

Sample :

 

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Element	Electron Arrangements In Orbitals	Valence Electron	Valency Of Element
Li	1s²,2s¹	1	1
Cl	1s²,2s²2p⁶,3s²3p⁵	7	1
C	1s²,2s²2p²	4	4

So the Valency Of an Element depends on the Valence Electrons present in the Element.

What is Valency?

Valency is the combining or Bonding Capacity of a Particular Element. It can be easily calculated by knowing the element’s Valence electrons.

 

What are Valence Electrons?

The Electrons present in the very outermost Orbital of the atom

Does Valency have Any Sign?

The valency of elements does not have any sign.

But the Valency of elements has Charge.

 

• Positively Charged.(Loss of Electron)