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?

XENON:  Six arms of 363 atoms 2178
        Central tetrahedra 120
                                           -----
                               Total 2298
                                           -----
        Atomic weight 127.10
        Number weight 2298/18 127.66
META-XENON differs from xenon only by the substitution of two z’s for x
and y.