Question

valency of oxygen and silicon​

Answer 1

Explanation:

(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

Answer:

The valency of oxygen is 2, because it needs two atoms of hydrogen to form water.

The valency of silicon is 4 because it needs four atoms to fill .