( ( ( Modern ( relative ( atomic masses ) ) ) ( -LRB- ( ( ( a term ) ( specific ( to ( a ( given ( element sample ) ) ) ) ) ) -RRB- ) ) ) ( ( are ( calculated ( from ( ( ( ( measured values ) ( of ( ( atomic mass ) ( -LRB- ( ( for ( each nuclide ) ) -RRB- ) ) ) ) ) and ) ( ( isotopic composition ) ( of ( a sample ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Modern) (JJ relative) (JJ atomic) (NNS masses)) (PRN (-LRB- -LRB-) (NP (NP (DT a) (NN term)) (ADJP (JJ specific) (PP (TO to) (NP (DT a) (VBN given) (NN element) (NN sample))))) (-RRB- -RRB-))) (VP (VBP are) (VP (VBN calculated) (PP (IN from) (NP (NP (NP (JJ measured) (NNS values)) (PP (IN of) (NP (NP (JJ atomic) (NN mass)) (PRN (-LRB- -LRB-) (PP (IN for) (NP (DT each) (NN nuclide))) (-RRB- -RRB-))))) (CC and) (NP (NP (JJ isotopic) (NN composition)) (PP (IN of) (NP (DT a) (NN sample)))))))) (. .)))
Modern relative atomic masses (a term specific to a given element sample) are calculated from measured values of atomic mass (for each nuclide) and isotopic composition of a sample.
(ROOT (S (NP (DT The) (NN term) (NN percent) (NN composition)) (VP (VBZ means) (NP (DT the) (NN percentage)) (PP (IN by) (NP (NP (NN mass)) (PP (IN of) (NP (NP (DT each) (NN element)) (PP (IN in) (NP (DT a) (NN compound)))))))) (. .)))