Write down the electronic configuration of (i) sodium atom, and (ii) chlorine atom.

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

41 Explain why, a salt which does not conduct electricity in the solid state becomes a good conductor in molten state. 42 |How many electrons are there in the outermost shell of (i) a sodium atom, and (ii) a chlorine atom? 42 Show the formation of NaCl from sodium and chlorine atoms by the transfer of electron(s).