Question

Which of the following spectroscopic notations are not allowed? (State which rule is violated for each that is not allowed.) Select all that are True.

3p3

4h14

6p4

3g6

3d12

Answer 1

The notation in B is not allowed. It violates the rules for the principal quantum where its number can never be less than the orbital quantum number. In this case b represents h=14 which is more than the value of n=1.

Notations C and D also violate the rules, as the number of electrons in the given orbital exceeds its maximum number of electrons.

The maximum number of electrons in a subshell depends on the orbital. For s-orbital, the maximum number of electrons is 2 and for g-orbital, the maximum number of electrons is 18.

For option E, In the case of rotation, the gross selection rule is that the molecule must have a permanent electric dipole moment which is d13. i.e. only polar molecules will give a rotational spectrum.

Therefore, the notations that are allowed are a) and e) .

And B, C, D are Not allowed.