Why tin has an exceptionally low melting point?

The low value for tin’s melting point compared with lead is presumably due to tin forming a distorted 12-co-ordinated structure rather than a pure one. Tin has the unusually low melting point of 231.85°C, and the unusually high boiling point of 2260, 2270 or 2687°C, according to different authorities. This makes it easy to form alloys without loss in vaporization.

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