What is the electron configuration of chromium ( ) in the ground state?

CHEMISTRY · Single correct · A Level · Chemistry · Atomic structure · Atomic structure

Problem

What is the electron configuration of chromium ( Z=24Z = 24 ) in the ground state? (1) [Ar]3d7[\text{Ar}] 3d^7 (2) [Ar]4s23d4[\text{Ar}] 4s^2 3d^4 (3) [Ar]4s13d5[\text{Ar}] 4s^1 3d^5 (4) [Ar]4s14p5[\text{Ar}] 4s^1 4p^5

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