"Atomic" & this word describing the central region of an atom are both found before "power" & "fission"
... central part of the atom (the nucleus) is what breaks up and fission is 
another ... Photo: Carefully controlled: Before it was closed in the 1970s, .... 
nuclear bombs are both based on nuclear reactions in which atoms split... [DOC] [TLE] nuclear energy - National Geographic Society [PAR] May 24, 2011 ...