( ( ( ( ATOMIC MASS ) ( The mass ) ) ( of ( ( the nucleus ) ( in ( units ( of amu ) ) ) ) ) ) ( ( ( ( ( is ( for ( all ( practical purposes ) ) ) ) ( ( the mass ) ( of ( ( ( the atom ) or ) ( the ( atomic mass ) ) ) ) ) ) and ) ( is ( ( the sum ) ( of ( the ( ( protons and ) neutrons ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP ATOMIC) (NNP MASS)) (NP (DT The) (NN mass))) (PP (IN of) (NP (NP (DT the) (NN nucleus)) (PP (IN in) (NP (NP (NNS units)) (PP (IN of) (NP (NN amu)))))))) (VP (VP (VBZ is) (PP (IN for) (NP (DT all) (JJ practical) (NNS purposes))) (NP (NP (DT the) (NN mass)) (PP (IN of) (NP (NP (DT the) (NN atom)) (CC or) (NP (DT the) (JJ atomic) (NN mass)))))) (CC and) (VP (VBZ is) (NP (NP (DT the) (NN sum)) (PP (IN of) (NP (DT the) (NNS protons) (CC and) (NNS neutrons)))))) (. .)))
ATOMIC MASS The mass of the nucleus in units of amu is for all practical purposes the mass of the atom or the atomic mass and is the sum of the protons and neutrons.
(ROOT (S (NP (NP (DT The) (NN sum)) (PP (IN of) (NP (NP (DT the) (NNS masses)) (PP (IN of) (NP (NP (DT the) (NNS atoms)) (PP (IN in) (NP (DT the) (NN formula)))))))) (VP (VBZ is) (VP (VBN referred) (PP (TO to) (NP (RB as) (JJ molecular) (NN mass))))) (. .)))