For example, Isotopes of actinium has this reference in its Big Table header:

• "Universal Nuclide Chart". nucleonica. {{cite web}}: Unknown parameter |registration= ignored (|url-access= suggested) (help)

The link looks broken or bad to me. Can "someone" (ping ComplexRational) check & improve that reference? I can give a list of isotope pages that use it, just ask. -DePiep (talk) 15:16, 3 March 2019 (UTC)

Rough indication: some 95 out of 122 pages have this reference. -DePiep (talk) 15:37, 3 March 2019 (UTC)

@DePiep: I've noticed the same issue with the link, and I've been slowly replacing it with {{NUBASE 2016}} (half-life, spin, decay modes) and {{NUBASE 2016 II}} (mass) as I work through all 118 pages. Should I fix all of them at once, or continue at the rate I am working (completed 13 pages, but have been especially busy the past few days IRL)? ComplexRational (talk) 23:20, 3 March 2019 (UTC)

@ComplexRational: No need to replace all: in a week I'll put in the header-template so we can automate this stuff. Just do as you like in individual articles, no edits will be lost. -DePiep (talk) 10:48, 6 March 2019 (UTC)

Asking ComplexRational. For example, Isotopes of technetium. It has this source list:

• Isotope masses from:
  • {{NUBASE 2003}}
• Isotopic compositions and standard atomic masses from:
  • {{CIAAW2003}}
  • {{CIAAW 2005}}
• Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
  • {{NUBASE 2003}}
  • {{NNDC}}
  • N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide (ed.). CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0-8493-0485-9. {{cite book}}: Unknown parameter |nopp= ignored (|no-pp= suggested) (help)

Clearly, these are old & possibly outdated (for atomic masses they are, I know -- see {{CIAAW2016}}). So there is some updating/checking to do.

But apart from that, how should we handle these? I can embed them in the Big Table header. Example of good: Isotopes of hydrogen#List of isotopes has {{NUBASE 2016}} and {{NUBASE 2016 II}} with the mass ands decay column headers. Shall we strive to put all those refs in there? (They will have ref names, so can be reused in the article).

-DePiep (talk) 17:45, 3 March 2019 (UTC)

By now, the list of general refs that are used is:

• {{NUBASE 2016}}
• {{NUBASE 2016 II}}
• {{NUBASE 2003}} - Audi
• {{CIAAW2003}} - de Laeter
• {{CIAAW 2005}} - Wieser
• {{NNDC}}
• "Universal Nuclide Chart". nucleonica. {{cite web}}: Unknown parameter |registration= ignored (|url-access= suggested) (help)

Absolutely (and I already updated isotopes of hydrogen). In that case, the bulleted list can be phased out as the table header would have footnotes and named refs. ComplexRational (talk) 23:20, 3 March 2019 (UTC)