Transition metals with closed shells From wiki page about valence electrons:

An atom with a closed shell of valence electrons (corresponding to an
electron configuration $s^2p^6$ for main group elements or $d^{10}s^2p^6$ for
transition metals) tends to be chemically inert.

My question is, which are the transition metals with $d^{10}s^2p^6$? Looking at the periodic table, I do not see anyone.
After this paragraph, wiki says that valence orbitals for d-block elements (transition metals) are (see table):

ns (n-1)d np

I though one of the characteristics of transition metals is that they do not have electrons in last p orbital.
Your premise Wikipedia's statement about transition metals seems to be flawed.
(1) It isn't possible to have a transition metal that has the electronic structure $\mathrm{(n-1)d^{10} ns^2np^6}$. Such an electronic structure would imply a noble gas.
(2) Gold $\mathrm{[Xe]4f^{14} 5d^{10} 6s^1}$ and platinum $\mathrm{[Xe]4f^{14} 5d^{9} 6s^1}$ are the most noble metals and neither even has a $\mathrm{(n-1)d^{10} ns^2}$ configuration.

Granted these configurations are for the free atom, not the bulk metal...