Electronic Configuration of Elements, Extra Stability of Half-Filled and Completely Filled Orbitals. NEET Questions

Physical Chemistry - Atomic Structure

Electronic Configuration of Elements, Extra Stability of Half-Filled and Completely Filled Orbitals. MCQ Questions


1.
Which of the following electronic configurations is most stable?
A.
3d⁵ 4s¹
B.
3d⁶ 4s¹
C.
3d⁵ 4s²
D.
3d⁴ 4s²
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ANSWER :
A. 3d⁵ 4s¹
2.
Which element has a completely filled d-orbital?
A.
Cr
B.
Cu
C.
Zn
D.
Ag
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ANSWER :
C. Zn
3.
Which element has a half-filled d-orbital?
A.
Cr
B.
Ni
C.
Cu
D.
Fe
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ANSWER :
A. Cr
4.
Which of the following follows the Aufbau principle?
A.
[Ar] 3d⁵ 4s¹
B.
[Ar] 3d⁶ 4s¹
C.
[Ar] 3d⁷ 4s¹
D.
[Ar] 3d⁵ 4s²
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ANSWER :
D. [Ar] 3d⁵ 4s²
5.
Which of the following electronic configurations is incorrect?
A.
[Ar] 3d⁶ 4s²
B.
[Ar] 3d⁵ 4s¹
C.
[Ar] 3d⁷ 4s²
D.
[Ar] 3d¹⁰ 4s¹
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ANSWER :
C. [Ar] 3d⁷ 4s²
6.
Which of the following is the ground-state configuration of Fe (Z = 26)?

NEET - 2016

A.
[Ar] 3d⁶ 4s²
B.
[Ar] 3d⁷ 4s¹
C.
[Ar] 3d⁵ 4s²
D.
[Ar] 3d⁶ 4s¹
😑 View Answer Rough Work Error
ANSWER :
A. [Ar] 3d⁶ 4s²