Rules for Filling Electrons in Orbitals - Aufbau Principle NEET Questions

Physical Chemistry - Atomic Structure

Rules for Filling Electrons in Orbitals - Aufbau Principle MCQ Questions


13.
According to Aufbau principle, which orbital is filled after 6s?
A.
6p
B.
5d
C.
7s
D.
4f
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ANSWER :
D. 4f
14.
The correct sequence of filling orbitals after 4s is:
A.
3d, 4p, 5s, 4d
B.
4p, 4d, 3d, 5s
C.
4p, 3d, 4d, 5s
D.
4d, 4p, 3d, 5s
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ANSWER :
A. 3d, 4p, 5s, 4d
15.
The Aufbau principle does not apply strictly in which of the following cases?
A.
Chromium (Cr) and copper (Cu) atoms
B.
Carbon and nitrogen atoms
C.
Sodium and potassium atoms
D.
Hydrogen and helium atoms
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ANSWER :
A. Chromium (Cr) and copper (Cu) atoms
16.
Which of the following statements is correct about the Aufbau principle?
A.
It is a useful guide but exceptions may occur
B.
It applies only to noble gases
C.
It is a strict rule with no exceptions
D.
It applies only to hydrogen atoms
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ANSWER :
A. It is a useful guide but exceptions may occur
17.
For potassium (K, Z = 19), the 19th electron enters which orbital?
A.
3d
B.
3p
C.
4s
D.
4p
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ANSWER :
C. 4s
18.
The number of electrons in the 4s orbital of scandium (Sc, Z = 21) is:
A.
2
B.
1
C.
3
D.
0
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ANSWER :
A. 2