( ( ( Atomic weight ) ( -LRB- ( ( atomic mass ) -RRB- ) ) ) ( ( Approximately ( ( the sum ) ( of ( ( the number ) ( of ( ( ( protons and ) neutrons ) ( found ( in ( ( the nucleus ) ( of ( an atom ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Atomic) (NN weight)) (PRN (-LRB- -LRB-) (NP (JJ atomic) (NN mass)) (-RRB- -RRB-))) (VP (VBZ Approximately) (NP (NP (DT the) (NN sum)) (PP (IN of) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS protons) (CC and) (NNS neutrons)) (VP (VBN found) (PP (IN in) (NP (NP (DT the) (NN nucleus)) (PP (IN of) (NP (DT an) (NN atom)))))))))))) (. .)))
Atomic weight (atomic mass) Approximately the sum of the number of protons and neutrons found in the nucleus of an atom.
(ROOT (S (S (S (VP (VBG Adding) (NP (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS protons)))) (CC plus) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS neutrons)) (PP (IN in) (NP (DT an) (NN atom))))))))) (VP (VBZ decides) (NP (PRP$ its) (JJ approximate) (NN mass)))) (: ;) (S (NP (JJ atomic) (NN number)) (VP (VBZ is) (NP (NP (DT another) (NN word)) (PP (IN for) (NP (DT this) (NN value)))))) (. .)))