Molecular Orbital Theory
Molecular Orbital Theory explains chemical bonding by describing molecular orbitals formed from atomic orbitals, influencing molecular properties like bond order, magnetism, and stability.
Core Principles
- Molecular orbitals are formed by the Linear Combination of Atomic Orbitals (LCAO).
- There are three types of molecular orbitals: bonding, antibonding, and non-bonding.
- Bonding molecular orbitals have lower energy and are formed by additive overlap, increasing electron density between nuclei.
- Antibonding molecular orbitals have higher energy and are formed by subtractive overlap, decreasing electron density between nuclei.
- Non-bonding molecular orbitals have energy intermediate to bonding and antibonding orbitals and do not participate in bonding.
- Molecular orbital diagrams illustrate the filling of electrons according to Aufbau Principle, Pauli Exclusion Principle, and Hund's Rule.
Formulas
- Bond Order = 1/2 (N_b - N_a)
- Bond Order = 1/2 (Number of bonding electrons - Number of antibonding electrons)
Quiz
- What is the primary method for forming molecular orbitals from atomic orbitals?: Linear Combination of Atomic Orbitals (LCAO)
- Which type of molecular orbital has lower energy and contributes to bond formation?: Bonding molecular orbital
- A molecule with all paired electrons in its molecular orbitals is described as:: Diamagnetic
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