Why Doesn't Gold Tarnish?

Why doesn't gold tarnish? A simple answer might be that it's a so-called "noble metal"—its atoms don't like to chemically react with others. But a more complex answer also answers *why* gold atoms are so unreactive. Some of it is due to special relativity, and some is due to a phenomenon called reconstruction. Hosted by: Hank Green (he/him) ---------- Support us for $8/month on Patreon and keep SciShow going! https://www.patreon.com/scishow Or support us directly: https://complexly.com/support Join our SciShow email list to get the latest news and highlights: https://mailchi.mp/scishow/email -