Total number of orbitals associated with third shell will be _____.

1.  2

2.  4

3.  9

4.  3

Hint: Azimuthal quantum number

Azimuthal quantum number. ‘l’ is also known as orbital angular momentum or subsidiary quantum number. It defines the three-dimensional shape of the orbital. For a given value of n, l can have n values ranging from 0 to n – 1, that is, for a given value of n, the possible value of l are : l = 0, 1, 2, ..........(n–1).