Q. How many unpaired electrons are present in a nitrogen atom? (2023)
Solution
Nitrogen has an atomic number of 7, with the electron configuration of 1s² 2s² 2p³, resulting in 3 unpaired electrons in the 2p subshell.
Correct Answer:
C
— 3
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Q. What is the electron configuration of a chlorine atom (atomic number 17)? (2020)
-
A.
1s² 2s² 2p⁶ 3s² 3p⁵
-
B.
1s² 2s² 2p⁶ 3s² 3p⁶
-
C.
1s² 2s² 2p⁶ 3s² 3p⁴
-
D.
1s² 2s² 2p⁶ 3s² 3d⁵
Solution
The electron configuration of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵, filling up to the 3p subshell.
Correct Answer:
A
— 1s² 2s² 2p⁶ 3s² 3p⁵
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Q. What is the electron configuration of a neutral carbon atom? (2022)
-
A.
1s² 2s² 2p²
-
B.
1s² 2s² 2p⁶
-
C.
1s² 2s² 2p⁴
-
D.
1s² 2s² 2p³
Solution
Carbon has an atomic number of 6, and its electron configuration is 1s² 2s² 2p².
Correct Answer:
A
— 1s² 2s² 2p²
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Q. What is the electron configuration of an oxygen atom? (2021)
-
A.
1s² 2s² 2p⁴
-
B.
1s² 2s² 2p²
-
C.
1s² 2s² 2p⁶
-
D.
1s² 2s² 2p³
Solution
Oxygen has 8 electrons, and its electron configuration is 1s² 2s² 2p⁴.
Correct Answer:
A
— 1s² 2s² 2p⁴
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Q. What is the maximum number of orbitals in the p subshell? (2019)
Solution
The p subshell can hold a maximum of 3 orbitals.
Correct Answer:
B
— 3
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Q. What is the shape of an s orbital? (2023)
-
A.
Spherical
-
B.
Dumbbell
-
C.
Double dumbbell
-
D.
Linear
Solution
The s orbital has a spherical shape.
Correct Answer:
A
— Spherical
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Q. What is the total number of electrons in a neutral atom of carbon? (2019)
Solution
A neutral carbon atom has an atomic number of 6, which means it has 6 electrons.
Correct Answer:
B
— 6
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Q. What is the total number of neutrons in an atom of carbon-14? (2021)
Solution
Carbon-14 has an atomic number of 6 (6 protons). The mass number is 14, so the number of neutrons is 14 - 6 = 8.
Correct Answer:
B
— 7
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