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.
Why is 4s orbital filled before 3d orbital?
A.
4s has higher energy than 3d
B.
4s is closer to the nucleus than 3d
C.
4s has lower (n + l) value than 3d
D.
3d cannot accept electrons
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ANSWER :
C. 4s has lower (n + l) value than 3d
8.
Which of the following pairs of orbitals will have the same value of (n + l)?
A.
2s and 2p
B.
4s and 3d
C.
4s and 3p
D.
3s and 3p
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ANSWER :
C. 4s and 3p
9.
The correct order of energy of orbitals in the same shell is:
A.
d < p < s < f
B.
f < d < p < s
C.
p < s < d < f
D.
s < p < d < f
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ANSWER :
D. s < p < d < f
10.
In the ground state of an atom, an electron will preferentially occupy:
A.
The highest energy orbital
B.
Any orbital randomly
C.
The orbital closest to the nucleus only
D.
The lowest energy orbital available
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ANSWER :
D. The lowest energy orbital available
11.
The (n + l) value for the 5p orbital is:
A.
7
B.
6
C.
5
D.
4
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ANSWER :
B. 6
12.
Which orbital is filled first - 5s or 4p?
A.
4p, because (n + l) value is lower
B.
Both filled simultaneously
C.
5s, because (n + l) value is lower
D.
5s, because n value is higher
😑 View Answer Rough Work Error
ANSWER :
A. 4p, because (n + l) value is lower