Is silver the limit of transistor tech?

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Know very little about this topic, but I know of Moore's law and that silver's conductive properties make it theoretically possible to have single atom switches. Are single-atom silver transistors the best we could make? Is that something that's already happening and I'm just retarded? Was mainly considering it from a DD perspective on buying silver, but I wanted to ask some actual /sci/entists about it. Thanks.