( Electrons ( ( orbit ( ( the nucleus ) ( of ( an atom ) ) ) ) . ) )
(ROOT (S (NP (NNS Electrons)) (VP (VBZ orbit) (NP (NP (DT the) (NN nucleus)) (PP (IN of) (NP (DT an) (NN atom))))) (. .)))
Electrons orbit the nucleus of an atom.
(ROOT (S (NP (NP (DT The) (NN electron)) (VP (VBN released) (PP (IN during) (NP (JJ beta) (NN decay))))) (VP (VBZ is) (RB not) (NP (NP (DT an) (JJ orbital) (NN electron)) (PP (CC but) (NP (NP (DT an) (NN electron)) (SBAR (WHNP (WP$ whose) (NNS origin)) (S (VP (VBD was) (PP (IN in) (NP (DT the) (NN nucleus)))))))))) (. .)))