Question

How is the valency of an element determines if it's electric configuration is known ?​

Answer 1

Answer:

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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Answer 2

Answer:

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. The valency of an element of atomic number 9 would be 1 since the

number of valence electrons in its outermost shell is 7 so it needs only one electron to attain the noble gas configuration.