Valence Electrons for d-Block Elements?

[KC Navarro_1H]

For all elements in the d-block, do you also include the s orbital to determine valence electrons? In general, should we determine number of valence electrons from the shorthand version of the electron configuration?

[danielruiz1G]

for transition metals on the periodic table, they cant be assigned traditional valence electrons like the rest of the table according to the group, but in the d block it ranges from group 3 to 12 and all but group 3 that has 3 valence e-, can have a different number of valence e- depending on the situation. for example
group 4 can have from 2 to 4 valence electrons, group 5 can have 2 to 5 valence electrons, group 6 can have 2 to 6 valence electrons, group 7 can have 2 to 7 valence electrons, group 8 can have 2 or 3 valence electrons, group 9 can have 2 or 3 valence electrons, group 10 can have 2 or 3 valence electrons, group 11 can have 1 or 2 valence electrons,and group 12 can have 2 valence electrons.

[KC Navarro_1H]

for transition metals on the periodic table, they cant be assigned traditional valence electrons like the rest of the table according to the group, but in the d block it ranges from group 3 to 12 and all but group 3 that has 3 valence e-, can have a different number of valence e- depending on the situation. for example
group 4 can have from 2 to 4 valence electrons, group 5 can have 2 to 5 valence electrons, group 6 can have 2 to 6 valence electrons, group 7 can have 2 to 7 valence electrons, group 8 can have 2 or 3 valence electrons, group 9 can have 2 or 3 valence electrons, group 10 can have 2 or 3 valence electrons, group 11 can have 1 or 2 valence electrons,and group 12 can have 2 valence electrons.

Thank you! By depending on the situation, do you mean that you might need to get more valence electrons to fill an octet?