( ( The ( valence band ) ) ( ( is ( ( the ( energy ( range corresponding ) ) ) ( to ( electrons ( that ( are ( connected ( to ( ( a ( particular atom ) ) ( in ( the crystal ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ valence) (NN band)) (VP (VBZ is) (NP (NP (DT the) (NN energy) (NN range) (JJ corresponding)) (PP (TO to) (NP (NP (NNS electrons)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN connected) (PP (TO to) (NP (NP (DT a) (JJ particular) (NN atom)) (PP (IN in) (NP (DT the) (NN crystal))))))))))))) (. .)))
The valence band is the energy range corresponding to electrons that are connected to a particular atom in the crystal.
(ROOT (S (NP (NP (NNS Electrons)) (PP (IN in) (NP (NP (DT the) (JJ outer) (NN energy) (NN level)) (PP (IN of) (NP (DT an) (NN atom)))))) (VP (VBP are) (VP (VBN called) (NP (JJ valence) (NNS electrons)))) (. .)))