Question Detail

CHM 101 CHM 101 Past Questions Objective Question
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Question

The electronic configuration of chromium (atomic number 24) is:
Options
A 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁴ 4s²
B 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹
Correct Answer
C 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s⁰
D 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹ 4s¹
Correct Answer

Option B is the correct answer.

Detailed Explanation

Chromium has an anomalous configuration: [Ar] 3d⁵ 4s¹. This half-filled d subshell provides extra stability. The expected configuration would be 3d⁴ 4s².

Hint

Remember the exceptions for chromium and copper.

Question Info

Course: CHM 101
Topic: CHM 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 1293 of 1872
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