Question

3. Mention the rule deviated in the following configuration. 1s22s02p6​

Answer 1

CORRECT QUESTION:

Mention the rule deviated in the following configuration : 1s² 2s⁰ 2p⁶ .

Solution:

• The rule from which the above given configuration has deviated is the AUFBAU PRINCIPLE.

• Aufbau principle states that in the ground state of an atom, electrons will be filled in the lower energy orbitals before higher energy orbitals.

• 2p orbital has higher energy than 2s orbital.

• Now, in the above given configuration we can see that 6 electrons have been filled in 2p orbital (higher energy) before 2s (lower energy).

• Hence the above rule is deviated.

The correct configuration should have been (with same number of electrons):

$\boxed{ \bold{1 {s}^{2} \: 2 {s}^{2} \: 2 {p}^{4} ...........(correct)}}$