NegaTFEeem

NegaTFEeem is a hypothetical element with atomic number -12. Its symbol is NTFE. Is named after The Forbidden Element, which is shortened to TFE. Its systematic name is Negaunbium (Ng Ub).

It is the first negative element to use the -eem suffix.Its properties are exactly the same as the Forbidden Element. It is the first negative element with only radioactive isotopes. It is an anomaly as it has no stable isotopes, and it is before plumbingium, which is atomic number -82.