( ( ( Thallium 's ) ( atomic number ) ) ( ( ( ( is 81 ) and ) ( ( is ( in group ) ) ( 13 ( on ( the ( periodic table ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Thallium) (POS 's)) (JJ atomic) (NN number)) (VP (VP (VBZ is) (NP (CD 81))) (CC and) (VP (VBZ is) (PP (IN in) (NP (NN group))) (NP (NP (CD 13)) (PP (IN on) (NP (DT the) (JJ periodic) (NN table)))))) (. .)))
Thallium's atomic number is 81 and is in group 13 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)))) (. .)))