Answer to Question #93892 in Organic Chemistry for eze

Question

What principles or rules are violated in the following electronic configuration \\(1s^{2}2s^{2}2p_{x}^{2}2p_{y}^{1}\\)?

Answer 1

Hund's Rule is violated in the following electronic configuration:

1s^{2}2s^{2}2p_{x}^{2}2p_{y}^{1}

Hund's rule states that:

1.   Every orbital in a sublevel is singly occupied before any orbital is doubly occupied.

2.   All of the electrons in singly occupied orbitals have the same spin (to maximize total spin).

When assigning electrons to orbitals, an electron first seeks to fill all the orbitals with similar energy (also referred to as degenerate orbitals) before pairing with another electron in a half-filled orbital. Atoms at ground states tend to have as many unpaired electrons as possible.

The correct electronic configuration is 1s^{2}2s^{2}2p_{x}^{1}2p_{y}^{1}2p_{z}^{1}

References:

1.       Chemistry: LibreTexts [Electronic resource] : supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. - Mode of access: https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Electronic_Structure_of_Atoms_and_Molecules/Electronic_Configurations/Hund's_Rules. – Date of access: 06.09.2019.