Question

Which from following rule / principle states that "No two electrons in an atom can have the same set of four quantum numbers"?

• A. Pauli's exclusion principle
• B. Hund's rule
• C. Aufbau rule
• D. Heisenberg uncertainty principle

Hint:

Logic Tip: The word "Exclusion" is the key. It \textit{excludes} the possibility of two electrons being in the exact same quantum state. This is why a single orbital (which fixes $n, l,$ and $m_l$) can only hold two electrons, forcing them to have different spin quantum numbers ($m_s = +1/2$ and $-1/2$).

Answer 1

The Correct Option is A