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The Bohr model of the atom strictly applies to the simplest possible
atom - Hydrogen - consisting of one proton and one orbiting electron.
What of more complex atoms with more protons and electrons?
Although their detailed structure is quite involved due to the
complicated interactions amongst the constituents, the ideas of
quantum theory discussed so far, augmented by one further assumption
called the Pauli Exclusion Principle, are surprisingly
successful at explaining some qualitative features. We first discuss
the general structure of the periodic table.