Noble metal physics
In physics, the analogue of a noble metal is a lot of strict. It requires that the d-bands of the cyberbanking anatomy are filled. From this perspective, alone copper, argent and gold are noble metals, as all d-like bands are abounding and do not cantankerous the Fermi level.
The aberration in acuteness can calmly be apparent during the alertness of apple-pie metal surfaces in an ultra-high vacuum: surfaces of "physically defined" noble metals (e.g., gold) are simple to apple-pie and accumulate apple-pie for a continued time, while those of platinum or palladium, for example, are covered by carbon monoxide actual quickly.
However, d-hybridized bands do cantankerous the Fermi akin to a basal extent. For platinum, two d-bands cantankerous the Fermi level, alteration its actinic behaviour such that it can action as a catalyst.