Question

The electronic configuration of an element is based on

• A. Aufbau principle
• B. Hund's rule
• C. Pauli's exclusion principle
• D. All of the above

Answer 1

The Correct Option is D

Correct answer: All of the above 

Explanation:
The electronic configuration of an element is determined using the following three principles: 

1. Aufbau Principle:
Electrons fill the lowest energy orbitals first before moving to higher ones. 

2. Hund's Rule:
Electrons occupy all degenerate orbitals singly first, with parallel spins, before pairing begins. 

3. Pauli's Exclusion Principle:
No two electrons in an atom can have the same set of four quantum numbers; i.e., an orbital can hold a maximum of 2 electrons with opposite spins. 

Hence, the correct answer is: All of the above.