Scandium's last electron goes into the 3d orbital, so the numbers are n=3, l=2, m=+2 (or 0, depending on the order you fill), s=+½. Honestly, I had to look this up again—it's like relearning circuit diagrams for a new PCB. My life says the obvious answer in the book isn't always the one you remember under pressure; in the repair shop, we first check the most common point of failure, not the textbook sequence. So, for me, the key is remembering the "address" of that electron, 3d¹, before assigning the m value.
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