this post was submitted on 28 Jan 2026
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xkcd #3200: Chemical Formula

Title text:

Some of the atoms in the molecule are very weakly bound.

Transcript:

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Source: https://xkcd.com/3200/

explainxkcd for #3200

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[–] palordrolap@fedia.io 14 points 1 day ago (5 children)

There are exotic atoms in that chemical formula that aren't in the periodic table. Not even if you count the equivalent table of potential antimatter atoms.

Muonium is sure to exist in non-zero quantities at any one time, for example.

[–] Pyro@programming.dev 12 points 1 day ago (1 children)
[–] fruitycoder@sh.itjust.works 2 points 7 hours ago

This made me laugh too much

[–] WR5@lemmy.world 4 points 23 hours ago* (last edited 23 hours ago)

"Approximate chemical formula"

[–] kopasz7@sh.itjust.works 2 points 1 day ago (1 children)

Still can't find blackholium, what element number is it?

[–] Trail@lemmy.world 2 points 21 hours ago (2 children)
[–] palordrolap@fedia.io 2 points 15 hours ago (1 children)

-1 would be antihydrogen. Blackholium is whatever number is large enough to cause gravitational collapse, so probably one or two more than the largest neutron star.

[–] Trail@lemmy.world 1 points 8 hours ago

Yeah I was more like referring to an overflow or something.

[–] gegil@sopuli.xyz 1 points 1 day ago

What about elements beyond 119?

[–] nialv7@lemmy.world 1 points 1 day ago

And neutron stars.