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Gallium is the element that should not be stored in metal or glass containers. The reason is that gallium expands 3.1% when it solidifies at low temperatures and this can cause the container to break open. In other words, gallium expands when it freezes. For this reason, it is primarily stored in plastic packets inside other containers.
Gallium, discovered by French chemist, Paul Emile Lecoq de Boisbaudran, in 1875 has an atomic number of 31 and the symbol Ga. It is in group 13 and is classified as a metal. Gallium becomes a liquid in the range of room temperature and will actually melt if held in your bare hand.
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