Chemistry nerds, unite in frustration! Nothing triggers a scientist faster than sci-fi movies casually inventing "new elements" as plot devices. The periodic table is literally complete - we've synthesized elements all the way to 118! Sure, we might discover element 119 someday, but it won't be some magical substance that grants superpowers or opens interdimensional portals.
The exasperated character perfectly captures that moment when scientific accuracy gets thrown out the window for dramatic effect. Next they'll probably claim it has a half-life of "forever" and can somehow power their entire spaceship with just a pebble-sized amount. *deep scientific sigh*