( Electrons ( ( orbit ( ( the nucleus ) ( of ( ( the atom ) ( in ( various ( orbital levels ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Electrons)) (VP (VBZ orbit) (NP (NP (DT the) (NN nucleus)) (PP (IN of) (NP (NP (DT the) (NN atom)) (PP (IN in) (NP (JJ various) (JJ orbital) (NNS levels))))))) (. .)))
Electrons orbit the nucleus of the atom in various orbital 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)))))))))) (. .)))