What is your favorite chemical element?

[Astatine]

Francium - Alkalai metals are fun and the more dangerous, the more fun.

Roentgenium - I just like to wonder what an element that's below copper, silver, and gold on the periodic table would be like if it could be made in large quantities but was still super radioactive. I can imagine some good parables being written about misers who died because they weren't willing to spend their riches.

Unbihexium - Oh yes, eka-plutonium is happening people.

Roentgenium's half-life is way too short, but Polonium with a half-life of several decades is - according to this list: https://en.wikipedia.org/wiki/Prices_of_chemical_elements - the most expensive element with a price of about 50 trillion $ per kg.

[True Federalist (진정한 연방 주의자)]

Unununium because it has the funniest sounding name. I'm absolute garbage at chemistry so please cut me some slack!

It was renamed some years ago (now called Roentgenium) - Currently, there are no discovered elements with systematic names.

FTFY

While all 118 discovered elements have nonsystematic names (from Hydrogen to Oganesson), ununennium (element 119) and beyond still exist at least theoretically, but appear to be undiscoverable with our current technology as their predicted half-lives are all way too short.

Thanks, absolutely correct. According to calculations, it seems likely that element 126 (perhaps also 120) could represent the "island of stability", having longer half-lives than one would expect (so perhaps milli- instead of nano-seconds), but as of now, they have not been discovered.

Element 126 would likely destroy the beauty of the current periodic table completely as another larger row for "superactinides" would have to be added (g-electrons and such stuff, but highly hypothetical).

Even if the island exists and we manage to synthesize elements in it, their half-lives will be so miniscule that their chemistry will be irrelevant (as well as expected to be highly unstable chemically as well as nuclearly). There's no useful reason for us to further extend the periodic table unless there are transoganesson elements with properties considerably different than expected.

[KoopaDaQuick 🇵🇸]

americum cuz maga 🇺🇸 🦅 🗽

[WMS]

Technetium, the first human-made element and proof of humanity’s dominance over the natural world

Of course it’s really Fluorine, the unstable serial killer of elements

[vitoNova]

I'll just randomly choose Silicon due to the fact that silicon-based lifeforms can theoretically exist.