What is a valency give two definition. Don't copy from Google please!
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Valency is the capacity of atom to accept or donate electrons.
The most outer shell in atom is called valence orbit.
The electrons present inside valence orbit are called valence electrons.
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Valency is the combining capacity of an element. For metals, it is equal to the number of electrons in the outermost shell of their atoms, and for nonmetals it is eight minus the number of electrons in the outermost shell.
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