What is the ground-state electron configuration of a neutral iron atom ()?
Answer and explanation
Correct answer: B.
- Step 1: Determine atomic number: Iron has . The preceding noble gas core is Argon ().
- Step 2: Following the Aufbau principle, the subshell fills first (), followed by six electrons in the subshell (). Thus: .
Answer
.
Why not the others: '' violates Hund's rule/Aufbau without the thermodynamic stability of half-filled subshells; '' omits the orbital; '' uses an incomplete core.
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