Electron orbitals. Each orbital (volume of space where the electrons of an atom are most likely to be found) holds a maximum of 2 electrons. An electron shell represents the average distance of an electron from the nucleus.

1. The first electron shell has one spherical (1s) orbital.
2. The second shell has one larger s orbital (2s) plus three dumbbell–shaped orbitals (2p).
3. Neon has 10 electrons.