( ( ( ( A ( horizontal row ) ) ( in ( the ( periodic table ) ) ) ) ( is called ) ) ( ( ( ( ( ( a ( a ( -RRB- group ) ) ) b ) -RRB- ) ( row ( ( ( c -RRB- ) ( family d ) ) -RRB- ) ) ) ( period 30 ) ) . ) )
(ROOT (SINV (S (NP (NP (DT A) (JJ horizontal) (NN row)) (PP (IN in) (NP (DT the) (JJ periodic) (NN table)))) (VP (VBZ is) (VP (VBN called)))) (VP (PRN (NP (NP (DT a) (NNP a) (-RRB- -RRB-) (NN group)) (NP (SYM b))) (-RRB- -RRB-)) (MD row) (VP (VB c) (-RRB- -RRB-) (NP (NN family) (NNS d)) (-RRB- -RRB-))) (NP (NP (NN period)) (NP (CD 30))) (. .)))
A horizontal row in the periodic table is called a a) group b) row c) family d) period 30.
(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)))) (. .)))