Question

28
(a) Explain the formation of ionic compound CaO with electron dot structure.
Atomic number of calcium and oxygen are 20 and 8 respectively.
(b) Why do ionic compounds conduct electricity in molten state.
(c)Choose the amphoteric oxides from amongst the following oxides:
Na20, ZnO, Al2O3, CO2, H20.​

Answer 1

Explanation:

Calcium reacts with oxygen to form an ionic compound calcium oxide (CaO). The atomic number of calcium is 20 and that of oxygen is 8 . By losing two electrons ,the calcium atom forms a calcium ion( Ca2+ ) ,and by gaining two electrons ,the oxygen atom forms an oxide ion (O2-).