Halogen bonding, akin to hydrogen bonding, is a noncovalent interaction between a positive region on a halogen atom and a negative site, such as a lone pair on a nitrogen or oxygen. Following on the ...

Excerpted from A Tale of 7 Elements, by Eric Scerri. Reprinted with permission of Oxford University Press, June 2013. The story surrounding element 85 is one of the most complex and interesting among ...