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Why do alkali metals have low melting points?
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alkali metal
Modern version of the periodic table of the elements (printable).
The alkali metals have lower melting points than any other nongaseous group in the periodic table.1
This characteristic is a direct result of two primary factors:
- Large interatomic distances: Alkali metals possess a loose crystallographic arrangement, meaning the atoms within their crystals are spaced relatively far apart.1
- Weak bond energies: Because of these large distances, the metallic bonds holding the atoms together in their solid state are relatively weak.1
These same structural factors also contribute to the low densities and low heats of fusion observed in this group.1