Boundaries between academic disciplines are like borders between European countries. They’re crossed without blinking. You can’t understand what’s going on in your gut without knowing its chemistry, and gold’s properties make little sense without considering special relativity.

Gold is in the same periodic table family as copper and silver, but while its siblings form patina and a dark tarnish, respectively, gold retains its characteristic color in the presence of either smog or sea spray. Less known is the fact that gold can actually mimic chlorine’s relatives and forms salts with rubidium and cesium metals.
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