( ( ( ( 8.4 ( Relative ( atomic ( mass ( and ( relative ( molecular mass ) ) ) ) ) ) ) ( The terms ) ) ( ( ( atomic weight ) and ) ( molecular weight ) ) ) ( ( ( ( are obsolete ) and ) ( thus ( should ( be avoided ) ) ) ) . ) )
(ROOT (S (NP (NP (CD 8.4) (JJ Relative) (JJ atomic) (NN mass) (CC and) (JJ relative) (JJ molecular) (NN mass)) (NP (DT The) (NNS terms)) (NP (NP (JJ atomic) (NN weight)) (CC and) (NP (JJ molecular) (NN weight)))) (VP (VP (VBP are) (ADJP (JJ obsolete))) (CC and) (VP (ADVP (RB thus)) (MD should) (VP (VB be) (VP (VBN avoided))))) (. .)))
8.4 Relative atomic mass and relative molecular mass The terms atomic weight and molecular weight are obsolete and thus should be avoided.
(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))))) (. .)))