( ground ( ( state ( ( the ( lowest ( energy orbit ) ) ) ( of ( ( the electron ) ( in ( the atom ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN ground)) (VP (VBP state) (NP (NP (DT the) (JJS lowest) (NN energy) (NN orbit)) (PP (IN of) (NP (NP (DT the) (NN electron)) (PP (IN in) (NP (DT the) (NN atom))))))) (. .)))
ground state the lowest energy orbit of the electron in the atom.
(ROOT (S (NP (NP (NNS Electrons)) (PP (IN in) (NP (NP (JJ successive) (NNS atoms)) (PP (IN on) (NP (DT the) (JJ periodic) (NN table)))))) (VP (VBP tend) (S (VP (TO to) (VP (VB fill) (NP (JJ low-energy) (NNS orbitals)) (ADVP (RB first)))))) (. .)))