( Lithium ( ( is ( composed ( of ( ( three electrons ) ( ( ( ( ( bound ( by ( the ( electromagnetic force ) ) ) ) ( to ( a nucleus ) ) ) ( ( ( containing ( three protons ) ) along ) ( with ( either ( three ( or ( four neutrons ) ) ) ) ) ) ) , ) ( depending ( on ( ( ( the isotope ) , ) ( ( held together ) ( by ( the ( strong force ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Lithium)) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NP (CD three) (NNS electrons)) (VP (VBN bound) (PP (IN by) (NP (DT the) (JJ electromagnetic) (NN force))) (PP (TO to) (NP (DT a) (NN nucleus))) (S (VP (VBG containing) (NP (CD three) (NNS protons)) (PRT (RP along)) (PP (IN with) (NP (DT either) (CD three) (CC or) (CD four) (NNS neutrons))))) (, ,) (PP (VBG depending) (PP (IN on) (NP (NP (DT the) (NN isotope)) (, ,) (VP (VBN held) (ADVP (RB together)) (PP (IN by) (NP (DT the) (JJ strong) (NN force)))))))))))) (. .)))
Lithium is composed of three electrons bound by the electromagnetic force to a nucleus containing three protons along with either three or four neutrons, depending on the isotope, held together by the strong force.
(ROOT (S (NP (NNP Lithium)) (VP (VBZ has) (NP (CD three) (NNS electrons))) (. .)))