( This ( ( ( is ( ( the ( ( ( ( lightest stable ) or ) ( almost stable ) ) nucleus ) ) ( -LRB- ( ( ( the ( middle part ) ) ( of ( an atom ) ) ) -RRB- ) ) ) ) ( with ( ( ( much more ) neutron ) ( than proton ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (NP (NP (DT the) (ADJP (ADJP (JJS lightest) (JJ stable)) (CC or) (ADJP (RB almost) (JJ stable))) (NN nucleus)) (PRN (-LRB- -LRB-) (NP (NP (DT the) (JJ middle) (NN part)) (PP (IN of) (NP (DT an) (NN atom)))) (-RRB- -RRB-))) (PP (IN with) (NP (NP (ADJP (RB much) (JJR more)) (NN neutron)) (PP (IN than) (NP (NN proton)))))) (. .)))
This is the lightest stable or almost stable nucleus (the middle part of an atom) with much more neutron than proton.
(ROOT (S (NP (NP (NNP Nuclei)) (PP (IN with) (NP (NP (RB even) (NNS numbers)) (PP (IN of) (NP (NP (NNS protons)) (, ,) (NP (NNS neutrons)) (, ,) (CC or) (NP (DT both))))))) (VP (VBP are) (ADJP (RBR more) (JJ likely) (S (VP (TO to) (VP (VB be) (ADJP (JJ stable))))))) (. .)))