Question

1. Shown below are sets of n, d, mi, and m, quantum number combinations for electrons. {4, 2, -1, +%2} {5,0, -1, +%} {4,4, -1, +%} a) Which two of these combinations is incorrect and why are they incorrect? b) What is the orbital designation of the correct orbital, e.g. 18, 3p, etc. ce

Answer 1

a)
{4,2,-1,+1/2}
This is valid

{5,0,-1,+1/2}
Value of l is 0
So, valid values of ml are [0]
so, ml can't be -1
Hence, this is not valid

{4,4,-1,+1/2}
l must be less than n
Here value of n is 4
But value of l is 4
so, l can't be 4
Hence, this is not valid
Answer: option 2 and 3 are not valid

b)
{4,2,-1,+1/2}
l = 2 is for d orbital
So, this is 4d orbital
Answer: 4d