The chemical elements are the “conserved principles” or “kernels” of chemistry that are
retained when substances are altered. Comprehensive overviews of the chemistry of the …

This perspective article discusses some broadly-known and some less broadly-known
consequences of Einstein's special relativity in quantum chemistry, and provides a brief …

Extended Average Level (EAL) Dirac–Fock calculations on atoms and ions agree with
earlier work in that a rough shell-filling order for the elements 119–172 is 8s< 5g≤ 8p1/2< …

The periodic depictions of the natural system of elements produced by Mendeleyev and his
contemporaries were based on atomic mass A and chemical valence G of the elements then …

The spin–orbit coupling constants (SOCC) in atoms and ions of the first-through third-row
transition elements were calculated for the low-lying atomic states whose main electron …

Many chemical concepts hinge on the notion of an orbital called the lowest unoccupied
molecular orbital, or LUMO. This hypothetical orbital and the much more concrete highest …

The use of electron orbitals in quantum theory and chemistry is discussed. Common
misconceptions are highlighted. Suggestions are made how chemistry educators may …

For more than 150 years, the structure of the periodic system of the chemical elements has
intensively motivated research in different areas of chemistry and physics. However, there is …

Abstract The Periodic Law, one of the great discoveries in human history, is magnificent in
the art of chemistry. Different arrangements of chemical elements in differently shaped …

For heavy atoms, and for molecules with heavy atoms, a theoretical description of the
electronic structure needs to consider the finite speed of light and Einstein's special relativity …