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1 Allotropes are forms of the same element which exhibit different physical properties. 2  Elements such as carbon, oxygen, phosphorus, tin and sulfur, display allotropy.
Lead rarely forms intermetallics in solder joints but commonly encountered elements that may form intermetallic compounds with tin include copper, nickel, silver and gold. The intermetallic-forming elements can come from the substrates and coatings being soldered.