]
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
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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.
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