MCQM3692 · [1] Copper consists of two isotopes, 63Cu and 65Cu. The relative atomic mass of copper is 63.55. The abundance of 63Cu is x %. Which expression gives x ? A63.55 - 63/65 - 63 × 100B63.55 - 63/65 × 100C63 × 65/63.55D65 - 63.55/65 - 63 × 100 Next question →