The d-sub shell is one of the electron shells in an atom. It can hold a maximum of 10 electrons, which are distributed among its orbitals. Each orbital in the d-sub shell can hold 2 electrons.
There are 5 different orbitals in the d-sub shell, labeled as dxy, dxz, dyz, dz2, and dx2-y2. These orbitals have different shapes and orientations in space, and they can accommodate electrons with different energies.
Therefore, the answer is 5.