gold

Why is Gold yellow? Spoiler alert: it’s got to do with Einstein’s Theory of Relativity

You’ve probably not given it much thought, but the reason why gold is yellow (or rather, golden) is deeply ingrained in its atomic structure – and it’s because of something called relativistic quantum chemistry. Simply put, gold’s electrons move so fast that they exhibit relativistic contraction, shifting the wavelength of light absorbed to blue and reflecting…

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