( ( Radioactive decay ) ( ( is ( ( the process ) ( ( in which ) ( ( an ( unstable ( atomic nucleus ) ) ) ( ( loses energy ) ( by ( emitting ( ionizing ( ( particles and ) radiation ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Radioactive) (NN decay)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT an) (JJ unstable) (JJ atomic) (NN nucleus)) (VP (VBZ loses) (NP (NN energy)) (PP (IN by) (S (VP (VBG emitting) (NP (VBG ionizing) (NNS particles) (CC and) (NN radiation)))))))))) (. .)))
Radioactive decay is the process in which an unstable atomic nucleus loses energy by emitting ionizing particles and radiation.
(ROOT (S (NP (JJ Radioactive) (NN decay)) (VP (MD can) (VP (VB give) (PRT (RP off)) (NP (NN energy) (CC and) (NNS particles)))) (. .)))