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Question on electron shells and electronic configuration

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    So I know the following:
    - The first shell holds a maximum of 2 electrons
    - The 2nd shell holds a maximum of 8 electrons
    - The 3rd shell holds a maximum of 8 electrons

    Say if an an atom has more than 3 shells what is the
    Maximum Number of electrons that the shell can hold for 4 shells, 5 shells etc ?

    After 3 shells, it get's more complicated, and it's stuff you would learn properly in A Level Chemistry, but basically what happens is that some electrons go in to the outer shell, while other electrons go into inner shells as well. So for example in Iron, the electron configuration is 2, 8, 14, 2, So 6 electrons went into shell 3, and 2 into shell 4. This gives transition metals the ability sometimes to form two different ions, in the case of Iron, it would be 2+ or 3+. Iron bind Oxygen to form Iron(III) oxide - Fe2O3, or Iron(II) oxide - FeO. They both also look very different.
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