i.          Show the formation of dative bond for the cation in the above compound using appropriate Lewis symbol. 

                           ii.          Draw all the resonance structure for the anion in the above compound. State the most stable resonance structure.

                           i.          Draw a Lewis structure for each of the above molecules. 

                           ii.          (ii) Identify molecule(s) that do not obey the octet rule and state the type(s) of octet rule exception. 

                           i.          Draw the Lewis structure and state the shape of each molecule. 

                           ii.          Predict the bond angles of each molecule and explain the differences in the bond angles.. 

(b) Illustrate the hybridisation of the central atom of in SeF4 using orbital diagrams. Show and label the overlapping of orbitals in the molecule .  

(c) Magnesium is a good electrical conductor. By using band theory, explain the electrical conductivity in magnesium .  

                           i.          draw all the possible Lewis structures . 

                           ii.          choose the most stable Lewis structure. Explain. 

                           ii.          explain why iodate ion, IO3- disobeys octet rule . 

(b) By using Lewis structure, show and label the three types of chemical bonding that exist in an ionic compound, ammonium chloride, NH4Cl. 

Aluminium fluoride, AlF3, is an electrovalent compound. 

(a) Define electrovalent bond   

(b) Use Lewis dot symbol to show the formation of AlF3. 

(c) State the type of stability of F- ion.