Question

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 (nine)?


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Answer 1

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.

atomic no is 9 i.e its configuration is 1s2 2s2 2p5 thus its valency is 1 as it has one unpaired electron in its outer most shell

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