How to calculate the valency of a compound ??

1.	How to calculate the valency of a compound ??
Answer» ANSWER: For atoms , valency is the number of ELECTRONS gained , lost or shared by an atom to complete its octet ( BASICALLY, to ACHIEVE its noble gas configuration). If the number of electrons in the outermost SHELL is less than 4 , then the valency is the same as the number of electrons in the outermost shell.

Answer»

For atoms , valency is the number of ELECTRONS gained , lost or shared by an atom to complete its octet ( BASICALLY, to ACHIEVE its noble gas configuration). If the number of electrons in the outermost SHELL is less than 4 , then the valency is the same as the number of electrons in the outermost shell.

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How to calculate the valency of a compound ??​

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How to calculate the valency of a compound ??