.5 0. 1s 2S 1s 2S .5 [40056747. ] 2s 2S 2s 2S .5 [47501659. ] 3s 2S 3s 2S .5 [50103982. ] 4s 2S 4s 2S .5 [51307017. ] 5s 2S 5s 2S 1.5 [47526656. ] 3d 2D 3d 2D 1.5 [50114519. ] 4d 2D 4d 2D 1.5 [51312409. ] 5d 2D 5d 2D 2.5 [47535163. ] 3d 2D 3d 2D 2.5 [50118110. ] 4d 2D 4d 2D 2.5 [51314247. ] 5d 2D 5d 2D 3.5 [51315159. ] 5g 2G 5g 2G 4.5 [51315709. ] 5g 2G 5g 2G