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(ROOT (S (SBAR (NP (JJ Atomic) (NN mass)) (IN If) (S (NP (PRP you)) (VP (VP (VBP add) (PRT (RP together)) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS protons))))) (PRN (-LRB- -LRB-) (CC or) (VP (VBG atomic) (NP (NN number))) (-RRB- -RRB-)) (CC and) (VP (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS neutrons)))) (PP (IN in) (NP (NP (DT the) (NN nucleus)) (PP (IN of) (NP (DT an) (NN atom))))))))) (, ,) (NP (PRP you)) (VP (MD can) (VP (VB calculate) (NP (NP (DT the) (NN mass)) (PP (IN of) (NP (DT the) (NN atom)))))) (. .)))
Atomic mass If you add together the number of protons (or atomic number) and the number of neutrons in the nucleus of an atom, you can calculate the mass of the atom.
(ROOT (S (NP (NP (DT The) (NN mass)) (PP (IN of) (NP (NNS atoms)))) (VP (VBZ is) (VP (VBN based) (PP (IN on) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS protons) (CC and) (NNS neutrons))))) (PP (IN in) (NP (NN nucleus))))) (. .)))