Question

How to explain correlation between valencies with the group number in the periodic table

Answer 1

Explanation:

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.

Answer 2

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.

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.