There are many ficitional substances, including elements, in various
Star Trek productions. I certainly can't remember which fictional substances were said to be compounds and whch were said to be elements, and which were not specified.
.Everyone should remember from school that there are about 115 chemcial elements in real life, and that the heaviest elments are not found naturally on Earth or most other locations in the Universe, but have to synthicized in laboratories where they usually decay in split seconds.
So it is a question to resarch whether there is a real element 115 and whther it was known when TOS was made in the 1960s.
According to this Wikipedia list, there are 118 known elements.
https://en.wikipedia.org/wiki/List_of_chemical_elements
Element Moscovium was named after the location of the lab where it was first synthicized.
Moscovium is a
synthetic element with the
symbol Mc and
atomic number 115. It was first synthesized in 2003 by a joint team of Russian and American scientists at the
Joint Institute for Nuclear Research (JINR) in
Dubna, Russia. In December 2015, it was recognized as one of four new elements by the
Joint Working Party of international scientific bodies
IUPAC and
IUPAP. On 28 November 2016, it was officially named after the
Moscow Oblast, in which the JINR is situated.
[7][8][9]
https://en.wikipedia.org/wiki/Moscovium
The last three elements discovered before TOS were 102 Nobelium, 103 Lawrencium, and 104 Rutherfordium. 105 Dubnium was discovered in 1968 and 1970. 104 Seaborgium was discovered in 1974.
All elements beginning with 95 Americium have been discovered by being synthicized, since they decay rapidly and aren't found in nature on Earth. Of course they might be created by supernova explosions, but their half lives are probably so short that a starship would have to capture them during the supernova to collect a good amount. They shouldn't be fundon eaven the newest planets or asteroids.
And there are discussions of theorectical "islands of stability", heavy elements that might b emuch more stable than the elements which have been synthicized so far. So there is a slight possibility that there could be more or less natural elements heavier than Plutonium to be found in a science fiction context.
Actually the real elment 115, Moscovium, is theorised to have some isotopes in an "island of stability"
Moscovium is expected to be within an
island of stability centered on
copernicium (element 112) and
flerovium (element 114).
[61][62] Due to the expected high fission barriers, any nucleus within this island of stability exclusively decays by alpha decay and perhaps some electron capture and
beta decay.
[2] Although the known isotopes of moscovium do not actually have enough neutrons to be on the island of stability, they can be seen to approach the island as in general, the heavier isotopes are the longer-lived ones.
[6][43]
The heaviest isotope of Moscovium produced so far, 290 MC, has a half life of only 650 ms. 650 ms is 0.650 of a second. I guess some theoretical isotopes of Moscovium might possibly have half lifes long enough to be mentioned in a
Star Trek episode.
Moscovium was offiically named in 2016, so it would have had to have been mentioned under a fictional name in a TOS episode. And maybe it was called "element 115", or someone said that there were 115 known elments, or something.
Here are links to list of fictional substances in
Star Trek.
https://en.wikipedia.org/wiki/List_of_Star_Trek_materials
https://en-academic.com/dic.nsf/enwiki/10191430
https://memory-alpha.fandom.com/wiki/Elements
This site might also help:
https://www.ex-astris-scientia.org/index-info.htm
