( Specifically ( , ( ( an orbital ) ( ( describes ( ( ( a region ) ( in space ) ) ( where ( there ( is ( ( a ( ( 90 % ) change ) ) ( of ( finding ( an electron ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Specifically)) (, ,) (NP (DT an) (NN orbital)) (VP (VBZ describes) (NP (NP (DT a) (NN region)) (PP (IN in) (NP (NN space))) (SBAR (WHADVP (WRB where)) (S (NP (EX there)) (VP (VBZ is) (NP (NP (DT a) (ADJP (CD 90) (NN %)) (NN change)) (PP (IN of) (S (VP (VBG finding) (NP (DT an) (NN electron))))))))))) (. .)))
Specifically, an orbital describes a region in space where there is a 90% change of finding an electron.
(ROOT (S (NP (DT The) (NN orbital)) (VP (VBZ is) (NP (NP (DT the) (NN region)) (VP (VBN called) (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)))))))))))) (. .)))