( ( ( The ( mass ( and ( radioactive properties ) ) ) ) ( of ( an atom ) ) ) ( ( ( are ( dependent ( upon ( ( the number ) ( of ( ( protons and ) neutrons ) ) ) ) ) ) ( in ( the nucleus ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN mass) (CC and) (NN radioactive) (NNS properties)) (PP (IN of) (NP (DT an) (NN atom)))) (VP (VBP are) (ADJP (JJ dependent) (PP (IN upon) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS protons) (CC and) (NNS neutrons)))))) (PP (IN in) (NP (DT the) (NN nucleus)))) (. .)))
The mass and radioactive properties of an atom are dependent upon the number of protons and neutrons in the nucleus.
(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))))) (. .)))