( ( ( ( ( ( The ( valence electron ) ) , ) s ) , ) ( of ( the ( ( excited rare ) gas ) ) ) ) ( ( has ( ( a ( bond ( energy close ) ) ) ( to ( that ( of ( ( the ( alkali metal ) ) ( that ( ( follows it ) ( in ( the ( periodic table ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT The) (JJ valence) (NN electron)) (, ,) (NP (PRP s)) (, ,)) (PP (IN of) (NP (DT the) (ADJP (JJ excited) (JJ rare)) (NN gas)))) (VP (VBZ has) (NP (NP (DT a) (NN bond) (NN energy) (NN close)) (PP (TO to) (NP (NP (DT that)) (PP (IN of) (NP (NP (DT the) (JJ alkali) (NN metal)) (SBAR (WHNP (WDT that)) (S (VP (VBZ follows) (NP (PRP it)) (PP (IN in) (NP (DT the) (JJ periodic) (NN table)))))))))))) (. .)))
The valence electron, s, of the excited rare gas has a bond energy close to that of the alkali metal that follows it in the periodic table.
(ROOT (S (NP (JJ Metallic) (NNS bonds)) (VP (VBP hold) (PRT (RP together)) (NP (NP (JJ positive) (NN metal) (NNS ions)) (CC and) (NP (PRP$ their) (JJ valence) (NNS electrons)))) (. .)))