Question

In a multi-electron atom, which of the following orbital’s described by the three quantum numbers will have the same energy in the absence of magnetic and electric field ?

(i) n = 1, l = 0, m = 0 (ii) n =2, l = 0, m = 0 (iii) n = 2, l = 1, m = 1 (iv) n = 3, l = 2, m =1 (v) n = 3, l = 2, m = 0

• A. (iv) and (v)
• B. (iii) and (iv)
• C. (ii) and (iii)
• D. (i) and (ii)

Answer 1

Answer: (A)

(iv) and (v)

Answer 2

The electron having same principle quantum number and azimuthal quantum number will be the same energy in absence of magnetic and electric field.

(iv) n = 3, l = 2, m =1

(v) n = 3, l = 2, m = 0

have same n and l value.