Question

How is the valency of an element decided ? explain with examples​

Answer 1

$<I>$ Valency means combining capicity of an element .Relationship between the number of valence electrons and valency :-

Valence electrons are the number of

electrons present in the outermost shell of an atom.Valency is the combing capicity of an element to form bonds with the other elements.
$<b>$

$\bold{For \:Example :-}$

Let us take the case of Oxygen whose Atomic number is 8.Thus,its electronic configuration is 2,6.

Oxygen has 6 electrons in its outermost shell and requires 2 more electrons to complete its octet state.

So,here Oxygen has 6 valence electrons and 2 as its valency .

The number of valence electrons increases from left to right in the periodic table.

If the number of valence electrons of an element is equal to 4 as that of carbon,the the element would also have same valency that is 4.

Answer 2

valency=valency is the term that decides no of valence electron present in that element

Ex =carbon has 4 valence electrons in there last shell therefor valence electrons are 4 and the valence is +4 or -4

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