How can the valency of an element be determined if its electronic
configuration is known? What will be the valency of an element of
atomic number 9?
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An element's valency is determined by the number of electrons in its outer shell. Hence, the number of valence electrons obtained from the electronic configuration of the element gives the valency i.e. the number of electrons lost, gained or shared by the element to attain the noble gas configuration.
Explanation:
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