How many different types of orbitals are there for each electron shell?

First shell (n=1): 1 type (s)
Second shell (n=2): 2 types (s, p)
Third shell (n=3): 3 types (s, p, d)
Fourth shell (n=4): 4 types (s, p, d, f)

For each electron shell, there are four different types of orbitals: s, p, d, and f orbitals.

For each electron shell (n):

The number of orbital types increases with n, corresponding to the angular momentum quantum number (l) values from 0 to n−1.