“行行退二位”法则图是这样制作的:(1)将s轨道从下至上排一纵行,即(1s,2s,3s……(2)又将p轨道从下至上排一纵行,即2p,3p,4p……(3)再将d轨道从下至上排一纵行,即3d,4d,5d……(4)最后,将f轨道从下至上排一纵行,即4f,5f,6f……其间,每一纵行轨道的起点,均比前一行退后两个位置,(如图)。然后,用带箭头的线条平行串联,就得到了电子填 The “retreat-and-retreat” law diagram is produced as follows: (1) The s-track is lined up from the bottom to the top, that is, (1s, 2s, 3s...(2) and then the p-rail is aligned from bottom to top. Lines, ie, 2p, 3p, 4p... (3) Then move the d orbit from the bottom to the top, ie 3d, 4d, 5d... (4) Finally, move the f orbit from the bottom to the top, ie 4f, 5f, 6f... In the meantime, the starting point of each vertical track is two positions behind the previous one (as shown in the figure).