Question

Which of the following orbitals cannot exist? Explain.

9. Which of the following orbitals cannot exist? 2 b.4 C.24Q b. 4d c. 2d 6s

Answer 1

Ans. 2d

Explanation

The possible values of ( l ) for each principal quantum no are 0,1,2,3,..........(n-1)

where n is principal quantum no or shell no.

l is orbital quantum no.

l=o means s orbital l=1 means p orbital l=2 means d orbital

lets claculate no of orbitals

1) 2S here n=2 possible values of l are 0 and 1. l=0 s orbital and l=1 means p orbital.

Hence 2s orbital exists.

2) 4d here n=4 possible values of l are 0,1,2,3

There are s,p,d,f orbitals. Therefore 4d exist.

3) 2d here n=2 possible values of l are 0,1

There are only s and p orbital not d . So 2d does not exists.

4) 6s here n=6 possible values of l are 0,1,2,3,4,5

There are s,p,d,f,g orbitals so 6s exists.