The changes are mostly columns (quantities) to be added. We need to pre-define the tables using them. It appears that sets of elements require different columns (=tables). For now, we expect four different sets (four different table headers). No new rows foreseen (existing rows are: stable, and decay 1–4).
Within one table (=element), the number & type of isotopes (rows) are free for the editor (not be limited by table header or by this discussion).
The column set for 'stable' has a different 'header' already. For now, we can keep that way of doing. That is: each table can accommodate stable isotope rows.
Columns 'decay energy' and decay 'product' are removed.
Do not worry about: table format tweaking, which isotopes to list(!), exact value formatting, row-templates, linked/notlinked values, Infobox element (it will follow, later), how must I enter it (hardcode it. The isotope-row templates not used).
Do worry about: main table structure; columns: number, order, header text; covering all expected isotope situations per element?, possible values, add helpful examples
Implementation: when accepted, per element one table-header (1 out of 4) must be picked, to announce which columns are used. Then isotope data be entered & maintained. Can happen: empty cells. May not happen: number of columns in table varying (righthand side indenting).
Technically: When decided here, template changes will follow. Expect new parameter names like |spin=, but we'll try to smartly automate other details (such as correct table header picking).
Double sharp: "I find that when I write "Isotopes" sections in articles on stable elements (H to Bi, except Tc and Pm), I want to mention the stable isotopes and their natural abundance, but then one of the other things I want to go into is nuclear spin (important for Nuclear magnetic resonance (NMR))".
1H to 83Bi (except: Tc, Pm)
The 'spin' column is added to every table proposed. For the stable H–Bi elements, it is the only addition.
When all listed isotopes are stable, we can use a simplified header: remove column Decay mode. Note that the spin value is added.
Currently for isoboxes: boron, bromine, helium, lithium, magnesium, neon, oxygen. This list may change, since editors are free to reasonably add/remove nonstable isotopes (IOW, when a nonstable isotope row is added, this simple form can not be used any more. Also, the other way around).
Double sharp: "For the unstable elements past Bi, I would want a detail on where each natural isotope comes from in the radioactive decay chain, like I did in text at Radium#Isotopes."
84Po - E118(?), (+ Tc?, Pm?)
Parameter: |chain=
One value for every unstable isotope (row).
Possible values: <blank>, thorium-232, uranium-235, uranium-238, neptunium-237, ...
Double sharp: "For the most unstable superheavy elements from Lr onwards at the cutting edge of modern science, I would want to know where each isotope comes from, when it was synthesised first, and who did it. So once we go beyond the things covered in the main infobox, I am not sure if we can add anymore, because the needs of each element are a little bit different; but if we are splitting it out, then I would think that it ought to go into some more detail."
Lr - E121+
Columns added:
|from=: isotope(s) synthesised from.
Values: <blank>, Cm-249 or 248Cm
|1st-when=: date of first synthesis
Values: <blank>, year (preferably), full date (if needed)
^Oganessian, Yu. Ts.; Utyonkov, V. K.; Kovrizhnykh, N. D.; et al. (2022). "New isotope 286Mc produced in the 243Am+48Ca reaction". Physical Review C. 106 (064306). doi:10.1103/PhysRevC.106.064306.
WD: rgx101 PETSCAN · wtech /tpu · commons
mw:Lua man (patterns, debug, α) · T:SFW/s (M:,../sandbox) · M:String · TFA /better signpost adnws · SPEEDY CFSD · alerts 
WD: rgx101 PETSCAN · wtech /tpu · commons
mw:Lua man (patterns, debug, α) · T:SFW/s (M:,../sandbox) · M:String · TFA /better signpost adnws · SPEEDY CFSD · alerts 
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