Zinc is not regarded as a typical transition element because ____.
Correct answer C. its atom and its Zn²⁺ ion both have a completely filled 3d subshell
Explanation
A transition element forms at least one stable ion with a partly filled d subshell. Zinc is 3d¹⁰ 4s² and Zn²⁺ is 3d¹⁰, so it fails this test.
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