Question

Which of the following spectroscopic notations are not allowed?
a.) 4p5
b.) 4s2
c.) 5i2
d.) 6i14
e.) 5g20

Answer 1

Option (c), (d) and (e) are not allowed.
The spectroscopic notation
  
where, m is the number of electron in the L orbital. And the condition is L < n. Amd . And for s, p, d, f, g, h, i, the corresponding values of L are 0, 1, 2, 3, 4, 5, 6 respectively. Now, in the

option (c) & (d)
i implies L =6. But for that we require n > L =6. i.e., n > 6. So, 5i2 and 6i14 are not allowed.
option (e)
for g, L = 4. So, the maximum number of electron is
  
So, option (c), (d) and (e) are not allowed.