Rules for Filling Electrons in Orbitals - Aufbau Principle NEET Questions

Physical Chemistry - Atomic Structure

Rules for Filling Electrons in Orbitals - Aufbau Principle MCQ Questions


7.
In which case does the Aufbau principle not strictly hold?
A.
Sc³⁺
B.
Cu
C.
Na⁺
D.
Cl⁻
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ANSWER :
B. Cu
8.
Which orbital has the highest energy?
A.
4s
B.
3d
C.
5p
D.
4f
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ANSWER :
D. 4f
9.
The correct order of filling orbitals according to Aufbau’s principle is:
A.
1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p
B.
1s < 2s < 3s < 2p < 3p < 4s < 3d
C.
1s < 2s < 3p < 3s < 4s < 3d
D.
1s < 2s < 2p < 3p < 3s < 4s < 3d
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ANSWER :
A. 1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p
10.
Which of the following orbitals is filled last?
A.
4s
B.
4p
C.
4d
D.
4f
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ANSWER :
D. 4f
11.
The Aufbau principle does NOT apply to:
A.
Hydrogen
B.
He+
C.
Excited atoms
D.
Ions
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ANSWER :
C. Excited atoms
12.
Which of the following is the correct electronic configuration of Fe?

NEET - 2018

A.
[Ar] 3d⁶ 4s²
B.
[Ar] 3d⁷ 4s¹
C.
[Ar] 3d⁵ 4s²
D.
[Ar] 3d⁴ 4s²
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ANSWER :
A. [Ar] 3d⁶ 4s²