Question

which is not a violation of electron rules? * 1 point

Explanation:

• Pauli Exclusion Principle: States that no two electrons in an atom can have the same set of four quantum numbers. In an orbital, electrons must have opposite spins. Option \(c\) violates this as the \(2s\) orbital has two electrons with parallel spins. Option \(d\) violates it as the \(1s\) orbital has two electrons with parallel spins.
• Aufbau Principle: Electrons fill orbitals starting from the lowest - energy orbital. Option \(b\) violates this as the \(2s\) orbital is not fully filled before moving to higher - energy orbitals.
• Option \(a\) follows the electron - filling rules: \(1s\) is filled with two electrons of opposite spins, \(2s\) is filled with two electrons of opposite spins, and in the \(2p\) sub - shell, electrons fill one orbital at a time (Hund's rule) but since there is only one pair here (it could be part of a larger electron - filling scenario where it's just the start of filling \(2p\) and following the rules).

Answer:

A. Option Text