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Page 36
[Illustration: PLATE XX.]
HELIUM (Plate III, 5, and Plate XX, 1) shows two "cigar"-bearing
tetrahedra, and two hydrogen triangles, the tetrahedra revolving round an
egg-shaped central body, and the triangles spinning on their own axes while
performing a similar revolution. The whole has an attractively airy
appearance, as of a fairy element.
HELIUM: Two tetrahedra of 24 atoms 48
Two triangles of 9 atoms 18
Central egg 6
----
Total 72
----
Atomic weight 3.94
Number weight 72/18 4.00
NEON (Plate XX, 2 and 6) has six arms of the pattern shown in 2, radiating
from the central globe.
NEON: Six arms of 40 atoms 240
Central tetrahedra 120
----
Total 360
----
Atomic weight 19.90
Number weight 360/18 20.00
META-NEON (Plate XX, 3 and 6) differs from its comrade by the insertion of
an additional atom in each of the groups included in the second body within
its arm, and substituting a seven-atomed group for one of the triplets in
neon.
META-NEON: Six arms of 47 atoms 282
Central tetrahedra 120
----
Total 402
----
Atomic weight ----
Number weight 402/18 22.33
ARGON (Plate XX, 4, 6 and 7) shows within its arms the _b_ 63 which we met
in nitrogen, yttrium, vanadium and niobium, but not the "balloon," which we
shall find with it in krypton and its congeners.
ARGON: Six arms of 99 atoms 594
Central tetrahedra 120
----
Total 714
----
Atomic weight 39.60
Number weight 714/18 39.66
METARGON (Plate XX, 5, 6 and 7) again shows only an additional seven atoms
in each arm.
METARGON: Six arms of 106 atoms 636
Central tetrahedra 120
----
Total 756
----
Atomic weight ----
Number weight 756/18 42
[Illustration: PLATE XXI.]
KRYPTON (Plate XXI, 1 and 4, and Plate XX, 6 and 7) contains the nitrogen
"balloon," elongated by its juxtaposition to _b_ 63. The central tetrahedra
appear as usual.
KRYPTON: Six arms of 224 atoms 1344
Central tetrahedra 120
-----
Total 1464
-----
Atomic weight 81.20
Number weight 1464/18 81.33
META-KRYPTON differs only from krypton by the substitution of _z_ for _y_
in each arm of the star.
META-KRYPTON: Six arms of 231 atoms 1386
Central tetrahedra 120
-----
Total 1506
-----
Atomic weight -----
Number weight 1506/18 83.66
XENON (Plate XXI, 2 and 4, and Plate XX, 6 and 7) has a peculiarity shared
only by kalon, that _x_ and _y_ are asymmetrical, the centre of one having
three atoms and the centre of the other two. Is this done in order to
preserve the difference of seven from its comrade?
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