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Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

Electron Orbital Model

Electron Orbital Model

Orbitals are the areas outside of the atomic nucleus where electrons are most likely to reside. They are characterized by different energy levels, shapes, and three-dimensional orientations. The location of electrons is described most generally by a shell or principal energy level, then by a subshell within each shell, and finally, by individual orbitals found within the subshells.
The first shell is closest to the nucleus, and it has only one subshell with a single spherical orbital called the...

Standard Electrode Potentials

Standard Electrode Potentials

On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...

Electron Configurations

Electron Configurations

Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p,...

Electron Configuration of Multielectron Atoms

Electron Configuration of Multielectron Atoms

The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Related Experiment Video

Updated: Apr 17, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Correlated electron pseudopotentials for 3d-transition metals.

J R Trail¹, R J Needs¹

¹Theory of Condensed Matter Group, Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

The Journal of Chemical Physics

|February 16, 2015

Summary

This summary is machine-generated.

Correlated Electron Pseudopotentials (CEPPs) were adapted for 3d-transition metals, including relativistic effects. These new CEPPs improve accuracy in correlated-electron calculations compared to older methods.

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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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Published on: October 12, 2019

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Published on: April 8, 2020

Area of Science:

Computational Chemistry
Quantum Chemistry
Solid State Physics

Background:

Correlated Electron Pseudopotentials (CEPPs) are crucial for accurately modeling electron interactions.
Existing pseudopotential methods often struggle with the complex electronic structures of transition metals.
Incorporating relativistic effects is essential for heavy elements.

Purpose of the Study:

To adapt the Correlated Electron Pseudopotentials (CEPPs) method for 3d-transition metals.
To include relativistic effects in the new CEPPs.
To develop and validate new CEPPs for atoms Sc through Fe.

Main Methods:

Atomic quantum chemical calculations were performed to construct new CEPPs.
Coupled cluster singles doubles and triples (CCSD(T)) calculations were used for validation.
Comparison of CEPPs with all-electron results for molecular properties.

Main Results:

New CEPPs were generated for Sc-Fe, accounting for correlated and relativistic electrons.
CEPPs demonstrated superior performance in correlated-electron calculations.
Dissociation energies, molecular geometries, and zero-point vibrational energies were accurately reproduced.

Conclusions:

The adapted CEPPs method provides a more accurate description of 3d-transition metals.
These new pseudopotentials outperform previous Hartree-Fock-based methods.
The findings enable more reliable computational studies of transition metal compounds.