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Most transition metals have a valence shell of 2 electrons. This is because most of the elements have a charge of 2+. I assume that if it were to have a different charge, then it would be a different number of electrons according to the charge number.
In most problems, we should be given the charge for transition metals. I think the only type of problems in which we would need to figure out the charge of a transition metal would be if we are given a compound with a nonmetal that we already know the charge of (for example, we'd be given Zn2O3 and because we know that O has a charge of 2-, we would have to deduce that in this instance, the Zn has charge 3+).
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