( ( responded ( to ( ( lithium and ) ( three ( of ( 16 -LRB- ) ) ) ) ) ) 19 )
(ROOT (SINV (VP (VBD responded) (PP (TO to) (NP (NP (NN lithium)) (CC and) (NP (NP (CD three)) (PP (IN of) (NP (CD 16) (NNS -LRB-))))))) (NP (CD 19))))
responded to lithium and three of 16 (19
(ROOT (S (NP (NNP Lithium)) (VP (VBZ has) (NP (CD three) (NNS electrons))) (. .)))