Cameroon GCE A-Level Chemistry Practice Questions - Cameroon General Certificate Of Education Advanced Level Chemistry (Subject Code 0715) Exam

What is the ground-state electronic configuration of a chromium atom (Cr, atomic number 24)?

[Ar] 3d4 4s2 [Ar] 3d6 4s0 [Ar] 3d5 4s1 [Ar] 4s2 4p4

Correct Answer:

[Ar] 3d5 4s1

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