Fluorine

Fluorine (9F) has 18 known isotopes ranging from 13F to 31F (with the exception of 30F) and two isomers (18mF and 26mF).

Simultaneous detection of uranium isotopes, fluorine advances nuclear nonproliferation monitoring - EurekAlert

Fluorine helps make PET plastic waste easier to recycle

Fluorine-based new drug synthesis at lightning speed