One constantly asks oneself: What is the
significance of these minute changes? Further investigators will probably
discover the answer.
14 bars of 132 atoms 1848
Atomic weight 100.91
Number weight 1848/18 102.66
RUTHENIUM (Plate XVIII, 1):
14 bars of 134 atoms 1876
Atomic weight 102.23
Number weight 1876/18 104.22
RHODIUM (Plate XVII, 2):
14 bars of 136 atoms 1904
Atomic weight 105.74
Number weight 1904/18 105.77
PALLADIUM (XVIII, 3):
The third sub-group, osmium, iridium and platinum, is, of course, more
complicated in its composition, but its builders succeed in preserving the
bar form, gaining the necessary increase by a multiplication of contained
spheres within the ovoids. Osmium has one peculiarity: the ovoid marked _a_
(XVIII, 4) takes the place of axis in the upper half of the bar, and the
three ovoids, marked _b_, revolve round it. In the lower half, the four
ovoids, _c_, revolve round the central axis. In platinum, we have marked
two forms as platinum A and platinum B, the latter having two four-atomed
spheres (XVIII, 6 _b_) in the place of the two triplets marked a.
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