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  2. Noble metal - Wikipedia

    en.wikipedia.org/wiki/Noble_metal

    The elements to the left of gold and silver have incompletely filled d-bands, which is believed to play a role in their catalytic properties. A common explanation is the d-band filling model of Hammer and Jens Nørskov , [ 18 ] [ 19 ] where the total d-bands are considered, not just the unoccupied states.