84
Number weight 918/18 51.00
NIOBIUM (Plate XII, 3) is as closely related to yttrium as is vanadium to
scandium. The little globes that scamper round the "cigars" contain twelve
atoms instead of eight (see 4 _e_).
The rest of the funnel is the same. In the central globe both the
tetrahedra have "cigars," and a central nine-atomed globe spins round in
the centre (see 4 _f_), seventeen atoms being thus added.
NIOBIUM: 6 funnels of 277 atoms 1662
Central globe 57
----
Total 1719
----
Atomic weight 93.25
Number weight 1719/18 95.50
III a.--Aluminium, gallium and indium were examined from this group. They
are triatomic, diamagnetic, and positive. The corresponding group contains
phosphorus, arsenic and antimony: bismuth also belongs to it, but was not
examined; they are triatomic, diamagnetic and negative. They have no
central globes.
[Illustration: PLATE XIII.]
ALUMINIUM (Plate XIII, 1), the head of the group, is, as usual, simple.
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