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Homework Help: Mass - elec-protons and diameter of copper

  1. Sep 20, 2010 #1
    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.

  2. jcsd
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