An element is simply a categorising system essentially if you have a bunch of atoms in some basic steel you have some iron and some carbon those are two diffent elements bit you could also have something that is purely one element like a pure diamond just carbon
each atom of an element has the same nucleus or core with the same number of protons that’s it that’s the deciding factor different numbers of other sub atomic molecules like electrons and protons just change the charge or a different isotope
So even if it’s made in a lab and is unstable it’s still an element you don’t see it in your day to day life but it doesn’t mean it’s not important in some lab or in a reactor
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