Wrong boiling point of Berkelium

[smic]

In elements.xml Berkelium has a lower boiling point than the melting point

    <scalar dataType="xsd:float" dictRef="bo:boilingpoint"  units="siUnits:kelvin">983</scalar>
    <scalar dataType="xsd:float" dictRef="bo:meltingpoint"  units="siUnits:kelvin">1258</scalar>

Wikipedia has only the melting point of 1259 K.

Also Arsenic:

    <scalar dataType="xsd:float" dictRef="bo:boilingpoint"  units="siUnits:kelvin">876</scalar>
    <scalar dataType="xsd:float" dictRef="bo:meltingpoint"  units="siUnits:kelvin">1090</scalar>

Wikipedia: Arsenic sublimes at atmospheric pressure at 887 K

[egonw]

hi @smic, what I have in mind is to create a Wikidata-powered BODR. All facts are stored as statements in Wikidata. By caching it in a GitHub repository, and regular (e.g. crontab-ed) updates, changes in Wikidata are reflected as patches, which we can curate.

Different from the current BODR, each statement will have one or more references, so that we can more acurately curate the content and see what source is preferred. That latter can actually also be reflected in Wikidata.

The other thing that Wikidata does nice, is making the distinction between elements and their allotropes. That too could possible explain the different values for these compounds: they can have more than one chemical structure and/or crystal, each with different melting points.

What do you think?

[smic-lumivero]

Yes, that would be great. I have done some experiments using Wikidata myself. However, as you mentioned, you also have to fetch the data for allotropes. For example, the boiling point of nitrogen can only be found for dinitrogen. The same goes for the three modifications of phosphorus. Have you started working on this, or is it just an idea?
I use a web scraper to get data from Wikipedia, for example.
https://en.wikipedia.org/wiki/Melting_points_of_the_elements_(data_page).

[egonw]

At this moment a worked out idea. But I needed to get https://doi.org/10.26434/chemrxiv-2025-53n0w out first