Copper – Properties Element Copper Atomic Number 29 Symbol Cu Element Category Transition Metal Phase at STP Solid Atomic Mass 63.546 Density at STP 8.92 Electron Configuration 3d10 4s1 Possible Oxidation States +1,2 Electron Affinity 118.4 Electronegativity 1.9 1st Ionization Energy 7.7264 Year of Discovery unknown Discoverer unknown Thermal properties Melting Point 1084.62 Boiling Point 2562 Thermal Expansion µm/(m
