Valence shell of transition metals definition is what?

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In the discussion, various cases of electron configurations are analyzed to determine valence electrons. For a half-filled ns with less than full (n-1)d, the valence is questioned as either 1 plus the number of (n-1)d electrons or just the (n-1)d count. When ns is fully filled and (n-1)d is less than full, the valence could be 2 or 2 plus the (n-1)d count. In cases where ns is fully filled and (n-1)d is full, the valence is debated as either 12, 2, or 10. The complexities of valence electrons highlight the limitations of simplified concepts in advanced discussions.
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Four cases what's valence electrons?
Case one: ns is half-filled and (n-1)d is less than full.
Is valence 1+number of electrons in (n-1)d or number of electrons in (n-1)d or 1?

Case two: ns is fully filled and (n-1)d is less than full
Is valence 2 or 2+ number of electrons in (n-1)d or number of electrons in (n-1)d?

Case three, ns is fully filled, and (n-1)d is full
is valence 12 or 2 or 10?

Case four: ns is half-filled, and (n-1)d is full.
is valence 1 or 1+10 or 10?
 
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