Question

Order of energy of orbitals

• A. 3s>3p>3d>4s
• B. 3s<3p<3d<4s
• C. 3s>3p>4s>3d
• D. 3s<3p<4s<3d

Answer 1

The Correct Option is D

1. Order of Energy in Orbitals:
The energy of orbitals increases with the value of the principal quantum number $n$ and the azimuthal quantum number $l$. However, the 4s orbital has a lower energy than the 3d orbital due to its shape and the penetration of the electron cloud closer to the nucleus. This leads to the following order of energy for the orbitals:

2. Correct Order of Energy:
The correct order is: $ 3s < 3p < 4s < 3d $
This means that the energy of orbitals increases as you go from $ 3s \rightarrow 3p \rightarrow 4s \rightarrow 3d $.

Final Answer:
The correct order of energy for the orbitals is $ {3s < 3p < 4s < 3d} $.