( ( ( the structure ) ( of ( ( ( ( ( ( ( ( ( the atom ) and ) ( the nucleus ) ) , ) radioactivity ) , ) ( nuclear energy ) ) and ) ( nuclear reactors ) ) ) ) . )
(ROOT (NP (NP (DT the) (NN structure)) (PP (IN of) (NP (NP (DT the) (NN atom)) (CC and) (NP (DT the) (NN nucleus)) (, ,) (NP (NN radioactivity)) (, ,) (NP (JJ nuclear) (NN energy)) (CC and) (NP (JJ nuclear) (NNS reactors)))) (. .)))
the structure of the atom and the nucleus, radioactivity, nuclear energy and nuclear reactors.
(ROOT (S (NP (NNP Radioactivity)) (VP (VP (VBZ is) (NP (NP (DT the) (NN release)) (PP (IN of) (NP (NNS particles))))) (CC and/or) (VP (NP (NN energy)) (PP (IN from) (NP (NP (DT the) (NN nucleus)) (PP (IN of) (NP (DT an) (NN atom))))))) (. .)))