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The element Sn has the outstanding property that it appears in a metallic and a semi-metallic modification, which possess almost the same stability. The associated interplay between delocalized and localized bonding governs the structures of alkali and alkaline earth metal stannides and leads to a large variety of different structure types. Even though the element Pb crystallizes in the  fcc  lattice, which is typical for metals, directed bonds between Pb atoms occur in compounds with electropositive metals.

Valence compounds at the border to intermetallics: alkali and alkaline earth metal stannides and plumbides