Neco Model Questions Vol1 2017 Chemistry Question 9

Practice objective / multiple choice question 9 from the 2017 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2017 Chemistry Objective / Multiple Choice Easy Difficulty
Question 9 NECO_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • objective

Write the ground‑state electron configuration of chromium (Z = 24). Then give the electron configuration of the Cr^{3+} ion and state the number of unpaired electrons present in Cr^{3+}.

Answer Options

A. Cr: [Ar] 3d^{4} 4s^{2}; Cr^{3+}: [Ar] 3d^{2}; unpaired electrons = 2
B. Cr: [Ar] 3d^{5} 4s^{2}; Cr^{3+}: [Ar] 3d^{2}; unpaired electrons = 2
Correct Answer C. Cr: [Ar] 3d^{5} 4s^{1}; Cr^{3+}: [Ar] 3d^{3}; unpaired electrons = 3
D. Cr: [Ar] 3d^{4} 4s^{1}; Cr^{3+}: [Ar] 3d^{4}; unpaired electrons = 4
Correct Answer
C
Correct Option:
Cr: [Ar] 3d^{5} 4s^{1}; Cr^{3+}: [Ar] 3d^{3}; unpaired electrons = 3

About This Question

This is Neco Model Questions Vol1 2017 Chemistry Question 9. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Easy .

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