atomorbitalenetype

Atomorbitalenetype is a coined term used in some theoretical discussions and educational materials to describe a category of atomic orbitals defined by two aspects: the spatial type determined by angular momentum (s, p, d, f, …) and the occupation- or energy-related characteristics of the orbital within a particular atom. In this sense, an atomorbitalenetype captures both the angular distribution of electron density and its occupancy status, such as whether the orbital is part of a closed shell, an open shell, or a valence set, as well as the influence of electron–electron interactions and spin–orbit coupling on energy ordering.

Labeling conventions for atomorbitalenetype vary by author, and there is no single universal standard. A typical shorthand might prefix the energy level and angular type, for example 1s_enetype, 2p_valence, or 3d_core. In standard quantum chemistry, orbitals are described by quantum numbers n, l, m_l and spin, together with occupancy; the phrase atomorbitalenetype thus overlaps with established ideas like orbital type (s/p/d/f), radial nodes, and occupation, but it is not part of formal nomenclature.

Applications and limitations: In teaching or exploratory modeling, the term can help discuss how orbital type interacts with energy ordering in different atoms or ions, and may aid reasoning about bonding participation, near-degeneracy effects, or spin splitting. However, because it is not a formal designation, any use of atomorbitalenetype should include a clear definition within the work to avoid ambiguity.