The table

This is the
 Columns connected to the various chemical groups
are numbered according to the new (1, 2, ... 32)
and old (1A, 2A, ... 8B) system of IUPAC.
 At the right is seen the numbering 0, 1, 2, 3 of the doubleshells.
These numbers indicate at the same time the maximal
angular momentum l_{max}occuring in the respective
doubleshell.
 The letters s, p, d, f at the heads of the columns
refer to the angular momenta l = 0, 1, 2, 3
of the boxes in the respective columns.
 As a consequence, the number of the boxes
 in the doubleshell #0 is 1 with l_{max} = 0
 in the doubleshell #1 is 2 with l_{max} = 1
 in the doubleshell #2 is 3 with l_{max} = 2
 in the doubleshell #3 is 4 with l_{max} = 3
The total number of boxes up to element 120 is 10.
 The lower halves of the doubleshells are designated
by the topical quantum number c = 1/2,
the upper halves carry c = +1/2.
This topical quantum number is not shown explicitly in the PSE table.
 The left halves of the boxes are designated
by the spin quantum number s = 1/2,
the right halves carry s = +1/2.
This spin quantum number is not shown explicitly in the PSE table.
In the DoubleShell Periodic System electronic states
are fourfold degenerate.
