The focus of this review is the presentation of the most important aspects of chemical
bonding in molecules of the main group atoms according to the current state of knowledge …

Recent developments in frequency metrology and optical clocks have been based on
electronic transitions in atoms and singly charged ions as references. The control over all …

Mendeleev's introduction of the periodic table of elements is one of the most important
milestones in the history of chemistry, as it brought order into the known chemical and …

The borders of the periodic table of the elements and of the chart of nuclides are not set in
stone. The desire to explore the properties of atoms and their nuclei in a regime of very large …

Four new elements with atomic numbers Z= 113, 115, 117 and 118 have recently been
added to the periodic table. The questions pertaining to these superheavy systems are at the …

During the last decade, six new superheavy elements were added into the seventh period of
the periodic table, with the approval of their names and symbols. This milestone was …

We report the implementation of effective quantum electrodynamics (QED) potentials for all-
electron four-component relativistic molecular calculations using the DIRAC code. The …

Optical spectroscopy of a primordial isotope has traditionally formed the basis for
understanding the atomic structure of an element. Such studies have been conducted for …

We review the progress in atomic structure theory with a focus on superheavy elements and
their predicted ground state configurations important for an element's placement in the …

Highly accurate theoretical predictions of transition energies in the radium monofluoride
molecule, 226 RaF, and radium cation, 226 Ra+, are reported. The considered transition X 2 …