( ( ( The number ) ( of ( protons ( -LRB- ( ( the ( atomic number ) ) -RRB- ) ) ) ) ) ( ( ( ( ( ( ( is ( ( the same ) ( for ( ( all atoms ) ( of ( a ( given element ) ) ) ) ) ) ) , ) and ) ( can ( be ( found ( on ( ( ( ( ( any ( periodic table ) ) . ) ( All ( beryllium atoms ) ) ) , ) ( for example ) ) ) ) ) ) ) , ) ( have ( 4 protons ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NP (NNS protons)) (PRN (-LRB- -LRB-) (NP (DT the) (JJ atomic) (NN number)) (-RRB- -RRB-))))) (VP (VP (VBZ is) (NP (NP (DT the) (JJ same)) (PP (IN for) (NP (NP (DT all) (NNS atoms)) (PP (IN of) (NP (DT a) (VBN given) (NN element))))))) (, ,) (CC and) (VP (MD can) (VP (VB be) (VP (VBN found) (PP (IN on) (NP (NP (NP (DT any) (JJ periodic) (NN table)) (. .) (NP (DT All) (NN beryllium) (NNS atoms)) (, ,)) (PP (IN for) (NP (NN example)))))))) (, ,) (VP (VBP have) (NP (CD 4) (NNS protons)))) (. .)))
The number of protons (the atomic number) is the  same for all atoms of a given element, and can be found on any periodic  table.  All beryllium atoms, for example,  have 4 protons.
(ROOT (S (NP (NP (DT The) (JJ low) (JJ atomic) (NN number)) (PP (IN of) (NP (NN beryllium)))) (VP (VBZ allows) (S (NP (PRP it)) (VP (TO to) (VP (VB absorb) (NP (NNPS x-rays)))))) (. .)))