tin Search Term: TinSource Category: ASSISTTin is the chemical element with the symbol Sn. It has the atomic number 50. It is a member of group 14 on the periodic table and is categorised as a post-transition metal. Synonyms: tin metal , tin foil; CAS Number: 7440-31-5; Signal Word: None. Tags: Snelement 507440-31-5tin metaltin foil