You probably learned in high school chemistry class that core electrons don't participate in chemical bonding.

The study combined experimental measurements with theoretical calculations, with the aim of analysing the nature and strength of the chemical bonding in antimony. “The strength of a bond depends ...

Intense femtosecond laser excitation can produce transient states of matter that would otherwise be inaccessible to laboratory investigation. At high excitation densities, the interatomic forces that ...