Binary Alkali and Alkaline Earth Stannides
When tin is combined with an alkali or alkaline earth metal some of the compounds formed have ionic structures containing monatomic or polyatomic tin anions (Zintl ions), e.g. Sn4− in Mg2Sn Sn94−in K4Sn9. Even with these metals not all of the compounds formed can be considered to be ionic with localised bonding, for example Sr3Sn5, a metallic compound,contains {Sn5} square pyramidal units.
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