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How to find valency of compounds acids bases and salts

How to find valency of compounds acids bases and salts

Grade:11

1 Answers

Arun
25750 Points
5 years ago
Dear student
 
Method to find Valency:              
 Find the nearest noble gas of the atom now check whether it has lose (or) gain electrons to get that noble gas configuration. The number of electrons that has been transferred (lost electrons or gained electrons) is called its valency.
Ex: Sodium (Na) – belongs to IA group or group-1 (1- valency electron). Its nearest noble gas is Neon (Ne).It will lose one electron to get Neon (noble gas) – configuration. So valency of Sodium is 1.
Chlorine (Cl) – belongs to VIIA group or group-17 (7- valency electrons). Its nearest noble gas is Argon (Ar).It will gain one electron to get Argon (noble gas) – configuration. So valency of Chlorine is 1.
There are some elements which shows variable valency. Showing different oxidation states while participating in chemical reactions is called variable valency.
Ex: Sulphur shows -2, +4, +6 oxidation states. So it posses variable valency.
 
Regards
Arun (askIITians forum expert)

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