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Scandium (Z = 21) counts as a transition element because its ground-state atom has what?
AA full 3d subshell
BFive unpaired 3d electrons
COne electron in 3d
DNo electrons in 4s
Answer & Solution
Correct answer: C. One electron in 3d
Scandium's atom is 3d1 4s2, so its 3d orbitals are incompletely filled in the ground state.
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