There are more ways to configure a single atom than there are card shuffles of a single deck.
what do you mean configure? I guess there are a lot of different electron orbitals but not quadrillions
I could have sworn there were infinite (but as energies increase they become increasingly easy to ionize).
Maybe for some theoretical ideal but definitely not in practice.
A typical grain of sand contains in the order of hundreds of quadrillions of atoms. A deck of cards can be encoded in 226 bits per deck, so one could encode in the order of a quadrillion decks of cards in a single grain of sand!