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A physicist by the name of ( George Gamow  then produced a formalism for describing alpha decay using quantum tunneling (first noted by ( Friedrich Hund )- which allowed atoms to cross the classically impenetrable Coulomb barrier.
In real atoms, the order in which electrons fill up different energy levels follows a set of rules devised many decades ago by German spectroscopist Friedrich Hund. The Dutch team discovered that electrons obey the same sort of rules in filling energy levels in what is essentially an oversized, two-dimensional atom.