Structure[]
Periods 6 and 7 both contain: a.) an alkali metal (very active metal), b.)an alkaline earth metal (active metal), c.) an f block (14 acive metals), d) a d block (10 quiet metals), e.) a p block (five aloof metals), and an inert fluid.
Electrons start misbehaving once you get to Period 8. Periodic details begin to blur. Two 9s and two 9p1/2 electrons mix in with the main period 8 electrons. The g block grows to 22 elements, so that period 8 ends at 172 rather than 168, which an 18-element g block would cause.
Period 9 is likely to mimic Period 8. The big features are all that remains: very active metal, active metals, quiet metals, aloof metals, and an inert fluid. Its g block should also be 22 elements long, putting the period's endpoint at Z = 226.
Period 10 will contain an h block with 22 electrons. Adding four electrons, as in periods 8 & 9 gives a band width of 26 electrons. But, this far up the Z axis, d3/2 or p3/2 electrons might start to occupy n+1 states. to add as many as 10 additional electrons to the block. That would be a total width of 36, which leads to Z = 316 as the end of period 10.
The final element should be around Z = 324. (See The Final Element.) Beyond that, a nuclear drop sprays neutrons until it explodes - a process that takes less than 1/1000 the time needed (on average) for a nucleus to grab an electron and become an element.
Elements[]
Period 10 is expected to begin at Bbs. It is expected to end between Tnh and Tuh.
(11-14-22)