define valency by taking examples of silicon and oxygen
Answers
Answer:
Atomic number of silicon is 14. The electronic configuration of the element is-K=2, L=8,m=4. According to the electronic configuration the valency is +4 or -4 because silicon can either gain 4 electrons or lose 4 electrons because it is a noble gas. Hence valency of silicon is 4.
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.