Question Detail

CHM 101 CHM 101 Past Questions Objective Question
Take CBT

Question

The electronic configuration of copper (atomic number = 29) is
Options
A 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹ 4s²
B 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹
Correct Answer
C 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²
D 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹ 4s¹
Correct Answer

Option B is the correct answer.

Detailed Explanation

Copper has an anomalous configuration: [Ar] 3d¹⁰ 4s¹. This gives greater stability due to a filled d subshell.

Hint

Remember the exceptions: Cr and Cu have half-filled or filled d subshells.

Question Info

Course: CHM 101
Topic: CHM 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 1069 of 1872
Previous Course Details Next