Question

define valency by taking the examples of magnessium and oxygen​

Answer 1

Answer:

$\huge\fbox \red{Answer}$

Definition: Valency is defined as the combining capacity of the element. It is determined by the number of valence shell electrons present in the atom.

If the number of valence electrons is less than or equal to 4 so the valency is the same as the number of electrons present.

If the number of valence electrons is more than 4 then the valency is 8-(the number of valence shell electrons).

Example:

(1)Silicon has atomic number 14. The electronic configuration of silicon is 2, 8, 4. The number of valence electrons is 4. So the valency is 4.

(2)Oxygen has an atomic number 8. The electronic configuration is 2, 6. The valency is (8-6)=2.

Answer 2

Valency

We all know that the chemical formula for water is H2O. How many times have we wondered why it is written as “H2O” and not something else? What is the reason for this particular formula? The answer to the above question is “Valency”. Let us know more about Valency and how it helps in determining a formula!