anglo-helvetium

Look at other dictionaries:

• astatine — noun /ˈæstətiːn,ˈæstətɪn/ A highly radioactive chemical element (symbol At) with atomic number 85 and one of the halogens.<!encyclopedic info It occurs in only one isotope with an atomic mass of 210. It is intensely radioactive with a half… …   Wiktionary