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Page 32
14 bars of 249 atoms 3486
Atomic weight 193.66
Number weight 3486/18 193.34
PLATINUM A (Plate XVIII, 6 _a_):
14 bars of 251 atoms 3514
Atomic weight ------
Number weight 3514/18 195.22
PLATINUM B (Plate XVIII, 6 _b_):
V a.--THE SPIKE GROUPS.
I place within this group lithium, potassium, rubidium, fluorine, and
manganese, because of their similarity in internal composition. Manganese
has fourteen spikes, arranged as in the iron group, but radiating from a
central globe. Potassium has nine, rubidium has sixteen, in both cases
radiating from a central globe. Lithium (Plate IV, 2) and fluorine (Plate
IV, 3) are the two types which dominate the group, lithium supplying the
spike which is reproduced in all of them, and fluorine the "nitrogen
balloon" which appears in all save lithium. It will be seen that the
natural affinities are strongly marked. They are all monads and
paramagnetic; lithium, potassium and rubidium are positive, while fluorine
and manganese are negative. We seem thus to have a pair, corresponding with
each other, as in other cases, and the interperiodic group is left
interperiodic and congruous within itself.
[Illustration: PLATE XIX.]
LITHIUM (Plate IV, 2 and Plate XIX, 1) is a striking and beautiful form,
with its upright cone, or spike, its eight radiating petals (_x_) at the
base of the cone, and the plate-like support in the centre of which is a
globe, on which the spike rests. The spike revolves swiftly on its axis,
carrying the petals with it; the plate revolves equally swiftly in the
opposite direction. Within the spike are two globes and a long ovoid; the
spheres within the globe revolve as a cross; within the ovoid are four
spheres containing atoms arranged on tetrahedra, and a central sphere with
an axis of three atoms surrounded by a spinning wheel of six.
LITHIUM: Spike of 63 atoms 63
8 petals of 6 atoms 48
Central globe of 16 atoms 16
----
Total 127
----
Atomic weight 6.98
Number weight 127/18 7.05
POTASSIUM (Plate XIX, 2) consists of nine radiating lithium spikes, but has
not petals; its central globe contains one hundred and thirty-four atoms,
consisting of the "nitrogen balloon," encircled by six four-atomed spheres.
POTASSIUM: 9 bars of 63 atoms 567
Central globe 134
----
Total 701
----
Atomic weight 38.94
Number weight 701/18 38.85
(The weight, as determined by Richards [_Nature_, July 18, 1907] is
39.114.)
RUBIDIUM: (Plate XIX, 3) adds an ovoid, containing three spheres--two
triplets and a sextet--to the lithium spike, of which it has sixteen, and
its central globe is composed of three "balloons."
RUBIDIUM: 16 spikes of 75 atoms 1200
Central globe 330
----
Total 1530
----
Atomic weight 84.85
Number weight 1530/18 85.00
The corresponding negative group consists only of fluorine and manganese,
so far as our investigations have gone.
FLUORINE (Plate IV, 3, and Plate XVII, 1) is a most peculiar looking object
like a projectile, and gives one the impression of being ready to shoot off
on the smallest provocation. The eight spikes, reversed funnels, coming to
a point, are probably responsible for this warlike appearance. The
remainder of the body is occupied by two "balloons."
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