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In terms of structure and bonding, explain the following observation
(a) The melting point of aluminium is higher than that of sodium
(b) Melting point of chlorine is lower than that of sulphur.

Answer Text:
(a) Aluminium has more delocalized electrons than sodium making it have strong metallic bonds hence high melting point.
(b) Chlorine molecules is smaller compared to that of sulphur. Thus the van der Waal’s forces in chlorine are
weaker.