( ( ( The ( relativistic stabilization ) ) ( of ( the ( 7s orbital ) ) ) ) ( ( is ( ( the explanation ) ( to ( ( the ( predicted ( electron configuration ) ) ) ( of ( ( darmstadtium , ) ( ( which , ) ( ( unusually ( for ( ( ( this group ) , ) conforms ) ) ) ( to ( that ( predicted ( by ( the ( Aufbau principle ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ relativistic) (NN stabilization)) (PP (IN of) (NP (DT the) (JJ 7s) (NN orbital)))) (VP (VBZ is) (NP (NP (DT the) (NN explanation)) (PP (TO to) (NP (NP (DT the) (JJ predicted) (NN electron) (NN configuration)) (PP (IN of) (NP (NP (NN darmstadtium)) (, ,) (SBAR (WHNP (WDT which)) (, ,) (S (ADJP (RB unusually) (PP (IN for) (NP (NP (DT this) (NN group)) (, ,) (NP (NNS conforms))))) (PP (TO to) (NP (NP (DT that)) (VP (VBN predicted) (PP (IN by) (NP (DT the) (NNP Aufbau) (NN principle)))))))))))))) (. .)))
The relativistic stabilization of the 7s orbital is the explanation to the predicted electron configuration of darmstadtium, which, unusually for this group, conforms to that predicted by the Aufbau principle.
(ROOT (S (NP (NNP Aufbau) (NN principle)) (VP (VBZ gives) (NP (NP (DT the) (NN order)) (PP (IN of) (NP (NP (NN electron)) (VP (VBG filling) (PP (IN in) (NP (DT an) (NN atom)))))))) (. .)))
Aufbau principle gives the order of electron filling in an atom.