Abstract
We revive intriguing, yet still unexplained, experimental results of Ehrlich and co-workers [Phys. Rev. Lett. 77, 1334 (1996); Phys. Rev. Lett. 67, 2509 (1991)] who have observed, that $5d$ adatoms distributed on (111) surface islands of $5d$ metals favor the adsorption at the cluster's edge rather than at the cluster's interior, which lies in contrast with the behavior of $4d$ and $3d$ elements. Our state of the art ab initio calculations demonstrate that such behavior is a direct consequence of the relativity of $5d$ metals.
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