"In the 8th there are thirteen pairs, but in the 9th the number is unknown, and at least twenty-one on the red side. The blue side fails to provide balanced mates for the six of the transuranium series, so all motion disappears into zero at that 9th octave position." [Atomic Suicide, page 264]
See Also
9th octave radioactive elements
Figure 7B.08 - Russells Periodic Chart of the Elements
octaves of elements
Periodic Table of the Elements
Radioactivity
Table of the Elements
The Russell Nine Octave Chart of the Elements
Uranium