( H ( -RRB- ( Energy ( ( is ( ( ( emitted ( in ( ( the form ) ( of ( ( light ( -LRB- ( electromagnetic ( rad iation ) ) ) ) ( as ( the ( electron moves ) ) ) ) ) ) ) ) ( from ( a ( higher orbit ) ) ) ) ( to ( ( a ( lower one ) ) ( -LRB- ( ( from ( ( a ( higher ( energy level ) ) ) ( to ( a ( lower one ) ) ) ) ) -RRB- ) ) ) ) ) ) . ) ) ) )
(ROOT (S (LST (JJ H)) (-RRB- -RRB-) (NP (VBG Energy)) (VP (VBZ is) (VP (VBN emitted) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NP (JJ light) (-LRB- -LRB-) (JJ electromagnetic) (NNS rad) (JJ iation)) (PP (IN as) (NP (DT the) (NN electron) (NNS moves))))))) (PP (IN from) (NP (DT a) (JJR higher) (NN orbit))) (PP (TO to) (NP (NP (DT a) (JJR lower) (NN one)) (PRN (-LRB- -LRB-) (PP (IN from) (NP (NP (DT a) (JJR higher) (NN energy) (NN level)) (PP (TO to) (NP (DT a) (JJR lower) (NN one))))) (-RRB- -RRB-)))))) (. .)))
H) Energy is emitted in the form of light (electromagnetic rad iation as the electron moves from a higher orbit to a lower one (from a higher energy level to a lower one).
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NNS electrons)) (VP (VB return) (PP (TO to) (NP (DT a) (JJR lower) (NN energy) (NN level)))))) (, ,) (NP (PRP they)) (VP (VBP emit) (NP (NP (DT the) (JJ excess) (NN energy)) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NN light))))))) (. .)))