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


13.
Which of the following electronic configurations is most stable?
A.
3d⁵ 4s¹
B.
3d⁶ 4s²
C.
3d⁷ 4s²
D.
3d⁴ 4s²
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ANSWER :
A. 3d⁵ 4s¹
14.
Which transition metal shows an exception to the Aufbau principle?
A.
Cu
B.
Fe
C.
Ni
D.
Mn
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ANSWER :
A. Cu
15.
Which of the following elements does not follow the expected electronic configuration?
A.
Cu
B.
Cr
C.
Both Cu and Cr
D.
None
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ANSWER :
C. Both Cu and Cr
16.
Which rule explains the extra stability of half-filled orbitals?
A.
Aufbau principle
B.
Pauli exclusion principle
C.
Hund’s rule
D.
Heisenberg uncertainty principle
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ANSWER :
C. Hund’s rule
17.
Which factor is responsible for the extra stability of half-filled orbitals?
A.
Exchange energy
B.
Shielding effect
C.
Orbital repulsion
D.
Aufbau principle
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ANSWER :
A. Exchange energy
18.
Which of the following is the electronic configuration of Mn (Z = 25)?
A.
[Ar] 3d⁶ 4s¹
B.
[Ar] 3d⁵ 4s²
C.
[Ar] 3d⁷ 4s²
D.
[Ar] 3d⁸ 4s¹
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ANSWER :
B. [Ar] 3d⁵ 4s²