Chapter 4 2022/2023

i. Draw the Lewis structure of SeO2.  

[2 Marks] 

ii. Based on VSEPR theory, predict the molecular geometry of SeO2.  

[2 Marks] 

iii. Determine the hybridisation on the central atom.   

[1 Mark] 

iv. Explain whether SeO2 is polar or non-polar.   

[3 Marks] 

b) Calcium is a silvery-white soft metal that tarnishes easily in the air. By using the electron sea model, illustrate the formation of metallic bonds in calcium. Explain the electrical conductivity exhibited by calcium. 

[5 Marks]      

c) Aluminium conducts electricity but aluminium chloride does not. Explain.  

[5 Marks]