Practice question
Question
Which element has the ground state electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸ 4s²?
Explanation
This configuration (Z=28) corresponds to Ni (period 4, group 10), with 3d⁸ 4s², distinguishing it from Fe (3d⁶ 4s²), Co (3d⁷ 4s²), or Cu (3d¹⁰ 4s¹).
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