( ( The ( electrons orbit ) ) ( ( the nucleus ) ( ( ( in ` ) ( energy levels ) ) ' ) ) )
(ROOT (NP (NP (DT The) (JJ electrons) (NN orbit)) (NP (NP (DT the) (NN nucleus)) (PP (IN in) (`` `) (NP (NN energy) (NNS levels)) ('' ')))))
The electrons orbit the nucleus in 'energy levels'
(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)))))))))) (. .)))