Why can we not figure out the number of valence electrons in transition metals?

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Jan 21, 2018

It is due to the $\left(n - 1\right) d$ and $n s$ orbitals being fairly close in energy to each other, usually allowing access of electrons from both sets of orbitals when bonding.

I go into detail on this here:
https://socratic.org/s/aMJvqHfH

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