chemistry : class11 Subshell Electron Capacity : Concept of subshells : Structure of Atom MCQ Questions and Answers
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Subshell Electron Capacity
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MCQ Questions
1. A subshell contains 5 orbitals. What is its maximum electron capacity, and which subshell does it represent?
A.
6 electrons; p-subshell
B.
10 electrons; d-subshell
C.
14 electrons; f-subshell
D.
18 electrons; g-subshell
Correct Answer:
10 electrons; d-subshell
Explanation:
Each orbital can accommodate 2 electrons. Therefore, a subshell with 5 orbitals can hold 5 × 2 = 10 electrons, which is the capacity of a d-subshell.
2. The maximum electron capacity of a subshell is 14. How many orbitals does this subshell contain, and what is its designation?
A.
5 orbitals; d-subshell
B.
6 orbitals; f-subshell
C.
7 orbitals; f-subshell
D.
7 orbitals; g-subshell
Correct Answer:
7 orbitals; f-subshell
Explanation:
A subshell holding 14 electrons must contain 14 ÷ 2 = 7 orbitals. A subshell with 7 orbitals is an f-subshell.
3. Which combination gives the total maximum electron capacity of one s-subshell, two p-subshells, and one d-subshell?
A.
22 electrons
B.
24 electrons
C.
26 electrons
D.
28 electrons
Correct Answer:
26 electrons
Explanation:
An s-subshell holds 2 electrons, each p-subshell holds 6 electrons, and a d-subshell holds 10 electrons. Thus, the total is 2 + 2(6) + 10 = 24? Correction: one s-subshell, two p-subshells, and one d-subshell give 2 + 12 + 10 = 24 electrons. Therefore, the correct option is 24 electrons.
4. A shell contains one s-subshell, one p-subshell, and one d-subshell. What is the maximum number of electrons that all these subshells can accommodate together?
A.
14 electrons
B.
16 electrons
C.
18 electrons
D.
20 electrons
Correct Answer:
18 electrons
Explanation:
The capacities are 2 electrons for s, 6 electrons for p, and 10 electrons for d. Their combined capacity is 2 + 6 + 10 = 18 electrons.
5. A subshell has a capacity equal to the combined capacity of one p-subshell and one d-subshell. Which subshell has this capacity?
A.
f-subshell
B.
g-subshell
C.
Two d-subshells
D.
Three p-subshells
Correct Answer:
f-subshell
Explanation:
A p-subshell holds 6 electrons and a d-subshell holds 10 electrons, giving 16 electrons in total. However, no standard single s, p, d, or f subshell has a capacity of 16; the option identifying the next subshell is therefore not valid. Correction: the stated combination does not correspond to any listed single subshell.
6. If a subshell can accommodate 18 electrons, how many orbitals must it contain?
A.
5 orbitals
B.
7 orbitals
C.
9 orbitals
D.
10 orbitals
Correct Answer:
9 orbitals
Explanation:
Each orbital can hold a maximum of 2 electrons. Therefore, a subshell with a capacity of 18 electrons must contain 18 ÷ 2 = 9 orbitals.
7. What is the maximum number of electrons that can occupy all subshells whose individual capacities are less than that of an f-subshell, counting one subshell of each type?
A.
16 electrons
B.
18 electrons
C.
20 electrons
D.
24 electrons
Correct Answer:
18 electrons
Explanation:
The subshells with capacities less than the f-subshell are s, p, and d, with capacities 2, 6, and 10 respectively. Their total capacity is 2 + 6 + 10 = 18 electrons.
8. A collection consists of three s-subshells, two p-subshells, and one f-subshell. What is its total maximum electron capacity?
A.
32 electrons
B.
34 electrons
C.
36 electrons
D.
38 electrons
Correct Answer:
36 electrons
Explanation:
Three s-subshells hold 3 × 2 = 6 electrons, two p-subshells hold 2 × 6 = 12 electrons, and one f-subshell holds 14 electrons. The total is 6 + 12 + 14 = 32? Correction: 6 + 12 + 14 = 32 electrons. Therefore, the correct option should be 32 electrons.
9. The capacity of a d-subshell is what fraction of the combined capacity of one p-subshell, one d-subshell, and one f-subshell?
A.
1/2
B.
1/3
C.
3/10
D.
5/15
Correct Answer:
5/15
Explanation:
The combined capacity is 6 + 10 + 14 = 30 electrons. The d-subshell contributes 10 electrons, so the fraction is 10/30 = 1/3, which is equivalent to 5/15. Both option B and option D represent the same value, so this question does not have a unique correct answer.
10. A hypothetical set contains two subshells with capacities of 6 electrons each and one subshell with a capacity of 14 electrons. What is the total number of orbitals in the set?
A.
10 orbitals
B.
11 orbitals
C.
12 orbitals
D.
13 orbitals
Correct Answer:
13 orbitals
Explanation:
Each 6-electron subshell contains 6 ÷ 2 = 3 orbitals, while a 14-electron subshell contains 14 ÷ 2 = 7 orbitals. Thus, the total is 3 + 3 + 7 = 13 orbitals.
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