Electronic configuration of lithium cannot be `1s^(3)` is best explained by (A) Pauli's exclusion principle (B) Aufbau's principle (C) Hund's rule (D) all of these

Electronic configuration of elements| Aufbau principle| Pauli exclusion principle and Hund's rule of maximum multiplicity

Electronic configuration of elements| Aufbau principle| Pauli exclusion principle and Hund's rule of maximum multiplicity

The orbital diagram in which both Pauli's exclusion principle and Hund's rule are violated , is :

Quantum numbers and Difference between orbit and orbital Questions | Electronic configuration of elements Questions |Pauli exclusion principle and Hund's rule of maximum multiplicity Questions

Assertion : The configuration of C cannot be 1s^2 2s^2 2p_x^2 . Reason : According to Pauli exclusion principle an orbital can have maximum of two electrons.

Questions based on Quantum numbers and Difference between orbit and orbital | Electronic configuration of elements | Aufbau principle | Pauli exclusion principle and Hund's rule of maximum multiplicity