Molecular Orbital Theory

Front

What is the definition of paramagnetism?

Back

Paramagnetic substances are weakly attracted to an applied magnetic field due to the presence of unpaired electrons.

Front

What is the principle that governs the filling of molecular orbitals?

Back

Molecular orbitals are filled according to the Aufbau principle, Pauli exclusion principle, and Hund's rule.

Front

What factors determine the shape and size of a molecular orbital?

Back

The shape and size of a molecular orbital depend on the types of atomic orbitals involved, the number of electrons, and the molecular geometry.

Front

What is the designation of the molecular orbital formed from the 1s atomic orbitals?

Back

The designation is σ_1s.

Front

What is a bonding molecular orbital?

Back

A bonding molecular orbital is formed when atomic orbitals combine constructively, resulting in increased electron density between the nuclei of bonded atoms.

Front

What is the difference between bonding and antibonding molecular orbitals?

Back

Bonding molecular orbitals have lower energy and increased electron density between nuclei, while antibonding molecular orbitals have higher energy and decreased electron density between nuclei.

Front

What is Hund's rule in the context of molecular orbitals?

Back

Hund's rule states that electrons will fill degenerate orbitals singly before pairing up, maximizing total spin.

Front

What is the significance of the Pauli exclusion principle in molecular orbital theory?

Back

The Pauli exclusion principle states that no two electrons can have the same set of quantum numbers, which means that each molecular orbital can hold a maximum of two electrons with opposite spins.

Front

How does molecular orbital theory explain the magnetic properties of molecules?

Back

Molecular orbital theory explains that the presence of unpaired electrons in molecular orbitals leads to paramagnetism, while all paired electrons result in diamagnetism.

Front

What is the role of atomic orbitals in forming molecular orbitals?

Back

Atomic orbitals combine to form molecular orbitals through linear combinations, resulting in bonding and antibonding orbitals.