Atoms used to be thought to look like little solar systems. Now they are thought to be nesting shells of probability density functions known as orbitals. The S1 and P1 orbitals are the first two filled with other S and P orbitals following along with the various D and F orbitals. The S orbitals are essentially spheres with the P orbitals looking like infinity signs.
Aside: A probability density function maps out where the electron is most likely to be in relation to the nucleus of the atom - not that it is there, just likely to be.