( ( ( ( ( ( ( ( Periodic properties ) , ) ( group trends ) ) , ) ( chemical bondings ) ) , ) ( structures ( of ( ( ( ionic and ) metallic ) solids ) ) ) ) . )
(ROOT (NP (NP (JJ Periodic) (NNS properties)) (, ,) (NP (NN group) (NNS trends)) (, ,) (NP (NN chemical) (NNS bondings)) (, ,) (NP (NP (NNS structures)) (PP (IN of) (NP (ADJP (JJ ionic) (CC and) (JJ metallic)) (NNS solids)))) (. .)))
Periodic properties, group trends, chemical bondings, structures of ionic and metallic solids.
(ROOT (S (NP (DT The) (JJ metallic) (NN bond)) (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (NP (NP (DT the) (NNS properties)) (PP (IN of) (NP (NNS metals))))))) (. .)))