( ( ( The atoms ) ( of ( each ( of ( these elements ) ) ) ) ) ( ( are ( composed ( of ( electrons ( , ( protons ( , ( and neutrons ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS atoms)) (PP (IN of) (NP (NP (DT each)) (PP (IN of) (NP (DT these) (NNS elements)))))) (VP (VBP are) (VP (VBN composed) (PP (IN of) (NP (NNS electrons) (, ,) (NNS protons) (, ,) (CC and) (NNS neutrons))))) (. .)))
The atoms of each of these elements are composed of electrons, protons, and 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)))) (. .)))