Question

3. Some elements and their valencies are given.
Elements Valency
Ba 2
Cl 1
Zn 2
O 2

a) Write the chemical formula of barium chloride.
b) Write the chemical formula of zinc oxide.
c) The chemical formula of calcium oxide is CaO. What is the valency of calcium ?
​

Answer 1

Answer:

here is your answer

Explanation:

a. BaCl2 is barium Chloride

b.ZnO is zinc oxide.

c. calcium atomic no.is 20 so electronic configaration is 2,8,8,2 here last no is 2 so it is easy to loose 2 electrons than gaining 6 electrons to complete the octate .so valency of calcium is 2.

HOPE IT HELP YOU