OnlineCBT
Chemistry · Structure of atom
हिन्दीAccording to the Aufbau principle and \( (n + l) \) rule, what is the correct increasing order of energy for the orbitals \( 3d, 4s, 4p \) and \( 5s \)?
Correct answer · Option 4
\( 4s < 3d < 4p < 5s \)
Explanation
Calculate \( (n+l) \): \( 4s \) (\( 4+0=4 \)), \( 3d \) (\( 3+2=5 \)), \( 4p \) (\( 4+1=5 \)), \( 5s \) (\( 5+0=5 \)). For equal \( (n+l) \), lower \( n \) has lower energy. Thus: \( 4s < 3d < 4p < 5s \).
