( This ( ( ( was ( particularly ( true ( for ( ( the elements ) ( of ( ( ( highest ( atomic number ) ) and ) weight ) ) ) ) ) ) ) ( where ( ( the ( large ( nuclear charge ) ) ) ( ( exerts ( strong ( repulsive forces ) ) ) ( ( ( on ( deuteron ( or ( proton projectiles ) ) ) ) ( but not ) ) ( on ( uncharged neutrons ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBD was) (ADJP (RB particularly) (JJ true) (PP (IN for) (NP (NP (DT the) (NNS elements)) (PP (IN of) (NP (NP (JJS highest) (JJ atomic) (NN number)) (CC and) (NP (NN weight))))))) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (JJ large) (JJ nuclear) (NN charge)) (VP (VBZ exerts) (NP (JJ strong) (NN repulsive) (NNS forces)) (PP (PP (IN on) (NP (NN deuteron) (CC or) (NN proton) (NNS projectiles))) (CONJP (CC but) (RB not)) (PP (IN on) (NP (JJ uncharged) (NNS neutrons)))))))) (. .)))
This was particularly true for the elements of highest atomic number and weight where the large nuclear charge exerts strong repulsive forces on deuteron or proton projectiles but not on uncharged neutrons.
(ROOT (S (S (VP (TO To) (VP (VB determine) (NP (NP (DT the) (JJ atomic) (NN weight)) (PP (IN of) (NP (DT an) (NN element))))))) (, ,) (NP (PRP you)) (VP (MD should) (VP (VB add) (PRT (RP up)) (NP (NNS protons) (CC and) (NNS neutrons)))) (. .)))