( They ( ( reasoned ( that ( ( lithium atoms ) ( have ( ( ( four neutrons ) and ) ( three protons ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD reasoned) (SBAR (IN that) (S (NP (NN lithium) (NNS atoms)) (VP (VBP have) (NP (NP (CD four) (NNS neutrons)) (CC and) (NP (CD three) (NNS protons))))))) (. .)))
They reasoned that lithium atoms have four neutrons and three protons.
(ROOT (S (NP (NNP Lithium)) (VP (VBZ has) (NP (CD three) (NNS electrons))) (. .)))