Question

Were the VSEPR rules and their application to the prediction/rationalization of the geometries of interhalogen species and homopolyatomic anions briefly discussed?

plz explain the question and give me the reference

Answer 1

VSERP theory used for the determination or predection of geometry of compounds and as well as complexes geometry is nothing but shapes of compounds some componds are exist in their shapes only shapes or geometry of the compond determined by the central atoms and their valency( Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. Thevalency of an element is related to how many electrons are in the outer shell.)and also ligands(Ligands are ions or neutral molecules that bond to a central metal atom or ion. Ligands act as Lewis bases (electron pair donors), and the central atom acts as a Lewis acid (electron pair acceptor). Ligands have at least one donor atom with an electron pair used to form covalent bonds with the central atom )

Valence shell electron pair repulsion (VSEPR) theory is a model used, in chemistry, to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms.^[1] It is also named Gillespie–Nyholm theory after its two main developers. The acronym "VSEPR" is pronounced either "ves-per"^[2] or "vuh-seh-per"^[3] by some chemists.

The premise of VSEPR is that the valence electron pairs surrounding an atom tend to repel each other, and will therefore adopt an arrangement that minimizes this repulsion, thus determining the molecule's geometry. Gillespie, now a Professor Emeritus at McMaster University, has emphasized that the electron-electron repulsion due to the Pauli exclusion principle is more important in determining molecular geometry than the electrostatic repulsion.^[4]

VSEPR theory is based on observable electron density rather than mathematical wave functions and hence unrelated to orbital hybridisation,^[5] although both address molecular shape. While it is mainly qualitative, VSEPR has a quantitative basis in quantum chemical topology (QCT) methods such as the electron localization function and the quantum theory of atoms in molecules