CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
Question

According to the Aufbau Principle, the correct order of energy of 3d, 4s and 4p orbitals is:


A

3d<4s<4p

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

4s<3d<4p

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C

4s<4p<3d

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

4p< 3d<4s

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B

4s<3d<4p


The explanation for the correct option:

According to the Aufbau principle, in the ground state of the atoms, the orbitals are filled with electrons to increase energy.

(B) 4s<3d<4p: The increasing order of energy of orbitals can find out by the (n+l) rule.

For 4p orbital, l=1 and n=4 and (n+l)=5

For 3d orbital, l=2 and n=3 and (n+l)=5

For 4s orbital, l=0 and n=4 and (n+l)=4

For the same value of (n+l), we can choose the higher value of n which will be having higher energy.

Therefore, the correct order of energy of 3d, 4s and 4p-orbitals is 4s<3d<4p.

The explanation for the incorrect option:

(A) 3d<4s<4p: Since the (n+l) value of 3d is greater than 4s, the option is wrong.

(C) 4s<4p<3d: The (n+l) value of 4p is greater than 3d.So the option is wrong.

(D) 4p< 3d<4s: The (n+l) value of 4p is greater than 3d and 4s.So the option is wrong.

Therefore, the correct option is (B).


flag
Suggest Corrections
thumbs-up
1
BNAT
mid-banner-image