1. Tardigrade
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  3. Chemistry
  4. Which of the following will violates Aufbau principle as well as Pauli's exclusion principle?

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Q. Which of the following will violates Aufbau principle as well as Pauli's exclusion principle?

NTA AbhyasNTA Abhyas 2020Structure of Atom

Solution:

Order of electron filling is

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 .......

It should be 1s2 2s2 2p1

In this case $2 \text{p}$ started filling before 2s, violating aufbau’s principle.

In $2 \text{p}_{\text{x}}$ two electrons have parallel spin. This violates pauli’s exclusion principle.