Draw the electron-dot structures of the following compounds and state the type of bonding in each case:

(i) C0₂ (ii) MgO (iii) H₂0 (iv) HCl (v) MgCl₂

36 What is the difference between a cation and an anion ? How are they formed ? Give the names and symbols of one cation and one anion. 37 Using electron-dot diagrams which show only the outermost shell electrons, show how a molecule of nitrogen, N2, is formed from two nitrogen atoms. What name is given to this type of bonding? (Atomic number of nitrogen is 7) 39 Using electron-dot diagrams which show only the outermost shell electrons, show how a molecule of oxygen, 02, is formed from two oxygen atoms. What name is given to this type of bonding? (At. No. of oxygen= 8) 40 Draw the electron-dot structures of the following compounds and state the type of bonding in each case:

(i) KCl (ii) NH₃ (iii) CaO (iv) N₂ (v) CaCl₂