( Deuterium ( ( is ( ( a ( ( stable isotope ) hydrogen ) ) ( with ( ( 1 neutron ) ( in ( ( the nucleus ) ( along ( with ( the proton ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Deuterium)) (VP (VBZ is) (NP (NP (DT a) (ADJP (JJ stable) (JJ isotope)) (NN hydrogen)) (PP (IN with) (NP (NP (CD 1) (NN neutron)) (PP (IN in) (NP (NP (DT the) (NN nucleus)) (ADVP (IN along) (PP (IN with) (NP (DT the) (NN proton)))))))))) (. .)))
Deuterium is a stable isotope hydrogen with 1 neutron in the nucleus along with the 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))))))) (. .)))