Question

which one of the following electronic configuration is incorrect?

Answer 1

option 2nd incorrect because 2s must have 2electron but here 2s contain only one electron .

Answer 2

The electronic configuration of option 2 is incorrect.

• As per the Aufbau principle, the next atomic orbitals are filled only when the previous ones are filled completely.
• The order 1s, 2s, 2p and then 3s.
• In the second option, the filling of 2p orbitals has started without the complete filling of 2s orbitals.
• So, this option is incorrect, as this violates the Aufbau principle.