There are nine orbitals in the third energy level or shell of electrons(n=3). Explanation: Here the value of principal quantum number is 3(n=3). For n=3 ,we get the value of angular momentum quantum number l= 0,1,2 [l=0 to n-1] •For l=0, we get s sublevel. •For l=1, we get p sublevel. •For l=2 ,we get d sublevel We will get three sublevels for n=3. These sublevels are 3s,3p and 3d. •The numbers of orbitals in sublevels is specified by the value of magnetic quantum number ,m l. •In s sublevel, we get one orbital. •In p sublevel , we get three orbitals. •In d sublevel, we get five orbitals. •The third energy level has three sublevels which are 3s, 3p and 3d. So, for n=3, we get 1+3+5=9 orbitals.