The group includes fluorine and bromine, but the most notorious is chlorine: 17 protons surrounded by 17 electrons, arranged in three shells of two, eight and seven, one short of being full.

Fluorine-studded cube ensnares electron Perfluorocubane can capture an electron within its interior, thanks to antibonding orbital overlap by Bethany Halford ...

In this method, we demonstrate the single-atom detection of lithium, fluorine, ... to probe light atoms by means of electron energy loss ... alternatively aligned in the 1D configuration.