How many orbitals are there in the third shell (n=3)?

 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 ,ml. 


•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. 

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