Periodic Table of Elements: Copper

Symbol: Cu Atomic mass: 63.546 u Melting point: 1,984°F (1,085°C) Electron configuration: [Ar] 3d¹⁰4s¹ CAS ID: 7440-50-8 Atomic number: 29 Density: 8.96 g/cm³ (Near room temperature) As far as we know, Copper has been in use since ancient times 9000 BC.