Molecular
structure:
atomic and
molecular
geometry
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Understanding Hund's Rule: Atomic and Molecular Geometry, Slides of Molecular Structure
Hund's rule, a principle used to predict the electronic configuration of atoms in their ground state. It details how electrons are distributed within orbitals to maximize total spin, providing a step-by-step guide and examples for nitrogen and iron. The document also references the aufbau principle and the pauli exclusion principle, offering a comprehensive understanding of electron configuration in chemistry. This is useful for students studying chemistry and atomic structure, providing clear explanations and practical examples to aid comprehension. Hund's rule is essential for predicting the magnetic properties and stability of atoms and molecules.
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2024/2025
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Molecular
structure:
atomic and
molecular
geometry
Hund's rule
“...in an atom that is in its ground state, electrons of the same energy level will be distributed in such a way that there are as many parallel spins as possible”.
USEFUL
- (^) Hund's rule applies when we write
the electronic configuration of an
atom in its ground state.
- (^) This means that it is a
complementary rule to other rules,
such as the Aufbau principle or
construction principle (also called
the rain rule) and the Pauli
exclusion principle.
Example 1: The electronic configurati on of nitrogen Nitrogen is element number 7, so it has a total of 7 electrons spinning around the nucleus. 1s 2 2s 2 2p 3 As we can see, the valence shell of nitrogen corresponds to energy level 2 (which is called the L shell) in which 8 electrons fit. However, nitrogen has only 5 valence electrons.