( ( ( ( ( ( Element ( Atomic number ) ) - ) ( ( number ( of ( ( ( protons ( in nucleus ) ) , ) ( unique characteristic ) ) ) ) ( of ( each ( element ( Atomic mass ) ) ) ) ) ) - ) ( number ( of ( ( ( protons and ) neutrons ) ( in ( nucleus III ) ) ) ) ) ) . )
(ROOT (NP (NP (NN Element) (JJ Atomic) (NN number)) (: -) (NP (NP (NN number)) (PP (IN of) (NP (NP (NNS protons)) (PP (IN in) (NP (NN nucleus))) (, ,) (ADJP (JJ unique) (JJ characteristic)))) (PP (IN of) (NP (DT each) (NN element) (JJ Atomic) (NN mass)))) (: -) (NP (NP (NN number)) (PP (IN of) (NP (NP (NNS protons) (CC and) (NNS neutrons)) (PP (IN in) (NP (NNP nucleus) (NNP III)))))) (. .)))
Element Atomic number - number of protons in nucleus, unique characteristic of each element Atomic mass- number of protons and neutrons in nucleus III.
(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))))) (. .)))