( ( a -RRB- ) ( ( An orbital ) ( ( can ( accommodate ( ( ( at most ) two ) electrons ) ) ) . ) ) )
(ROOT (S (LST (LS a) (-RRB- -RRB-)) (NP (DT An) (NN orbital)) (VP (MD can) (VP (VB accommodate) (NP (QP (IN at) (JJS most) (CD two)) (NNS electrons)))) (. .)))
a) An orbital can accommodate at most two electrons.
(ROOT (S (NP (DT The) (NN orbital)) (VP (VBZ is) (NP (NP (DT the) (NN area)) (SBAR (WHADVP (WRB where)) (S (NP (DT an) (NN electron)) (VP (VBZ is) (ADJP (RBS most) (JJ likely) (S (VP (TO to) (VP (VB be) (VP (VBN found))))))))))) (. .)))