Question

The orbital diagram in which aufbau principle is violated is:

A

option
B

option
C

option
D

option
Hard
Updated on : 2022-09-05
Solution
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Correct option is B)

Hint: Aufbau principle states that electrons getting filled in the orbitals in the increasing order of energy.

Step 1: The energy of an orbital is directly proportional to the  value.

The value for   level:

For energy level-

 

Where is the principal quantum number and is the azimuthal quantum number.

For orbital,

So,  

 

Step 2:

The value for level:

For energy level-

 

Where is the principal quantum number and is the azimuthal quantum number.

For orbital,

So,  

 

Step 3:

Comparison of value of two energy levels:

As the value of  for  orbital is less than that of  orbital so  orbital has lower energy than orbital. Therefore  orbital will get filled first then  orbital will starts filling.

Final answer:

So the orbital diagram in which Aufbau principle is violated is option (B).

So the correct option is (B).

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