Question

In a multi electron atom, which of the following orbitals described by the three quantum numbers will lose degeneracy in the presence of magnetic and electric field?
A. n = 1, l = 0, m = 0
B. n = 2, l = 0, m = 0
C. n = 2, l = 1, m = 1
D. n = 3, l = 2, m = 1
E. n = 3, l = 2, m = 0

• A. A and B
• B. B and C
• C. C and D
• D. D and E

Answer 1

The correct option is D D and E

For option (i), the orbital is 1s

For option (ii), the orbital is 2s

For option (iii), the orbital is 2p

These 3 are degenerate in presence of electrical and magnetic field

In options (iv) and (v) the degenerency is lost in presence of magnetic and electric field due to d-orbital splitting