Valence electrons of transition metals

Please tell me how to establish the valence electrons of transition metals, once you already know the atomic number.
For example:
-the valence electrons of:
-Pt - Platinum
-Au - Gold
-Ag -Silver

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If you click on each of these elements in the WebElements periodic chart, and scroll down the LEFT hand column, you will see ELECTRONIC CONFIGURATION for each of these you will see that there is on electron remaining in the highest s-shell; Platinum has 9 electrons in its f-shell while Ag and Au have the full 10 in theirs; that means that all three lelemnts are effectively univalent, though Pt can easily transfer electrons to other shells (typical transition metal behavior and form complex orbitals). That should put you on the right track.

:wink:

in gases or in organometallic complexes?

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