( ( ( Name ( three groups ) ) ( on ( the ( periodic table ) ) ) ) . )
(ROOT (S (VP (VB Name) (NP (CD three) (NNS groups)) (PP (IN on) (NP (DT the) (JJ periodic) (NN table)))) (. .)))
Name three groups on the periodic table.
(ROOT (S (NP (NP (NNP Group) (CD 13)) (PP (IN of) (NP (DT the) (JJ periodic) (NN table)))) (VP (VBZ is) (ADVP (RB also)) (VP (VBN called) (NP (DT the) (DT the) (NN boron) (NN group)))) (. .)))