When a first-row transition metal atom forms a positive ion, electrons are removed first from ____.
Correct answer A. the 4s orbital
Explanation
Although 4s fills before 3d, once 3d is occupied the 4s electrons are higher in energy and further out. They are therefore lost first, for example Ti [Ar]3d²4s² becomes Ti²⁺ [Ar]3d².
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