Question

Which energy shell is closer to the nucleus of an atom?

Answer 1

Shells:

1. The circular paths or orbits around the nucleus in which electrons revolve are known as shells.
2. The shells have fixed energy value.
3. Thus, shells are also known as energy levels.
4. Starting from the nucleus, the different energy levels are numbered as $1,2,3,4,$….. etc. or named as $\mathrm{K},\mathrm{L},\mathrm{M},\mathrm{N},$…… etc.

Thus, the energy shell closer to the nucleus of atom is the shell $1$ or the $\mathrm{K}$ shell.