1. The problem statement, all variables and given/known data The density of copper is 8930 kg m-3, its mass number is 63.55 and its atomic number is 29. a) Calculate the mass of a copper atom in kg. b) How may electrons and protons does a copper atom have? c) Estimate the diameter of a copper atom from this data. 2. Relevant equations 3. The attempt at a solution never did chem so im not sure about this stuff, is mass number the same as atomic mass? I think I might need Avogadro s number for this? formula? Have'nt tried b,c yet. thanks.