Question

The orbits or shells are represented by the letters ___________.

Answer 1

These orbits or shells are represented by the letters K, L, M, N... or the numbers, n=1, 2, 3, 4... The first orbit (i.e., for n = 1) is represented by letter K. Similarly, for n = 2, it is L − shell, for n = 3, it is M − shell and for n = 4, it is N − shell. These orbits or shells are also called energy levels.