Electron orbital shell is the correct terminology.
I'm not fresh on my chemistry, but size orbitals can hold increases as they move away from a cell. The maximum number of electrons that can occupy a specific energy level can be found using the following formula:
Electron Capacity = 2n²
This means that the first shell can hold 2 electrons, the next 8, the third 18, the fourth 32, the fifth 50, and the sixth can hold 72.
