English
Download app
Download app
Sonali Tikale
Follow
Posted 5 year ago
Sonali Tikale 
What is the relationship between the electronic  configuration of an element and it's valency
2 Answer(s)
Gurushala Expert
Follow
Posted 5 year ago Gurushala Expert

In general, the number of electrons in last shell in electronic configuration determines the valency of an atom. In simple, Valency is the number of electron a atom receive or donate to become stable during chemical reaction. Valency according to number of electrons in last shell ( valence shell) is as follows:- Valency 1 is for atom having 1 or 7 electron in their last shell. Valency 2 is for atom having 2 or 6 electron in their last shell. Valency 3 is for atom having 3 or 5 electron in their last shell. Valency 4 is for atom having 4 electron in their last shell.
Nishu Sharma
Follow
Posted 4 year ago Nishu Sharma

Valency is defined as the electrons present in outer most shell of electropositive elements whereas in case of electronegative elements valency is  no. Of electrons they need to fill their last shell.