The crossword solution for SN, chemically speaking is TIN. TIN is a chemical element with the symbol SN and atomic number 50. It is a post-transition metal in group 14 of the periodic table. TIN is one of the few elements that has been used and traded since ancient times. It is soft, malleable, and ductile, and has a low melting point. TIN is also resistant to corrosion and is often used to coat other metals to prevent rusting.