( ( ( An ( electron orbital ) ) ( can ( accommodate ( ( ( at most ) 2 ) electrons ) ) ) ) ( , ( ( each ( with opposite ) ) ( spins . ) ) ) )
(ROOT (S (S (NP (DT An) (NN electron) (NN orbital)) (VP (MD can) (VP (VB accommodate) (NP (QP (IN at) (JJS most) (CD 2)) (NNS electrons))))) (, ,) (NP (NP (DT each)) (PP (IN with) (NP (NN opposite)))) (VP (VBZ spins)) (. .)))
An electron orbital can accommodate at most 2 electrons, each with opposite spins.
(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))))))))))) (. .)))