I'm sorry if this has been answered before, but I didn't see it in the forums or on Theoryland, so I'm going to go ahead.
I recently read that a metal associated with allomantic properties has those properties no matter where they're from. For example, a Mistborn would be able to use tin from Sel or Roshar or Earth just as easily as they could use tin from Scadrial.
This got me thinking. There are a number of synthetic elements on Earth, elements that can only be created in a lab. Now, all of them are very unstable and only last for about a year at best, but it can be done.
So here's my question: If someone on Scadrial could figure out a way of making metals and could make them stable long term, would those metals still have their allomantic properties. Could they even make new metals?
I suppose to first step would be to try out soul forging, but that wouldn't work for making things like Atium, unless of course Atium turns out to be some ridiculously common element by a different name, but that doesn't seem likely.