Question

How is valence electrons of an element is related to its valancy

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.

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Answer 2

Answer:

if the valence electrons are less than or equal to 3 , then the valency of that element is the same of valance electron

On the other hand if the valance electron is greater than of equal to 4 then the valency of those elements are calculate by ( 8 - the number of electrons)

Explanation:

for example:

1) magnesium (atomic number = 12) ( 2,8,2)

here the valence electron is 2 , which is less than or equal to 3. hence, valency is also 2

2) sulfur (atomic number=16) (2,8,6)

here,the valence electron is 6,which is greater than 4, hence valency is ( 8-no if valence electrons)

i.e, 8-6=2

hence valency is 2.