The header of the wikipedia article mentions that because the resulting particles are usually unstable, the exotic atoms typically have short lifetimes.

If someone has the time to point to the research, the article would be massively improved by mentioning the typical lifetimes of each of the listed exotic atoms.

A "short lifetime" could be nanoseconds or could be years when you compare it to the traditional lifetime of the non-exotic version of the atom and knowing what is typical for each exotic atom would be good information to have at a glance.