Solid sodium chloride does not conduct electricity, whereas solid metallic sodium does.
Both substances crystallize in extended lattices but differ in the nature of their chemical bonding.
(a) Describe the arrangement of particles present in solid NaCl and in solid Na, specifying the role played by electrons in each solid.
(b) Explain why electrical conductivity is observed for solid Na but not for solid NaCl, even though both contain charged species.
(c) Compare the malleability of the two solids in terms of their bonding models.