It depends on the atomic number. If the atomic number is 5 it has five protons neutrons and electrons. The electrons make up the shells so the first shell is two electrons then the second 8 but there is only five so its an unstable atom.
A sulfur atom has 3 electron shells.
A sodium atom has 3 energy shells.
A bismuth atom has 6 electron shells.
Sulfur has three shells.
As silicon is in the third row of the periodic table, it has 3 shells. (2-8-4)
A neutral xenon atom has 8 electron shells with 6 completely filled shells and 2 partially filled shells.
4
2,8,8,8
3
2
The number of shells varies. The row number of the element is the number of shells. They don't really have names, but they're referred to by how many levels they are away from the nucleus.
Platinum is in the 6th period, meaning its atom has 6 energy shells. It is in Group 10 and has 78 electrons.