Central globe. The Central globe. Fig. 84, is complex and is borrowed from Cerium, its predecessor in the atomic weight list. It consists of a centre-piece of 27 Anu, Ce27, and then a ring of twenty segments, each containing 32 Anu. Thus the central globe is identical with Ce667. It also occurs in Neodymium.
Funnels. Praeseodymium has six similar funnels. Fig. 83. At the bottom of the funnel comes a group containing three ovoids, Moll, making Pr33. and then the N63 and N110 groups. Next comes the Yt44, and finally Nb60.
Praeseodymium = Ce667+6[Pr33+N63+N110+Yt44-(-Nb60]
Six funnels of 310 Anu
Total = 2527 Anu
Number weight jg = 140.4
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