Q. What is the electron configuration of a chlorine atom (atomic number 17)? (2020)
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A.
1s² 2s² 2p⁶ 3s² 3p⁵
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B.
1s² 2s² 2p⁶ 3s² 3p⁶
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C.
1s² 2s² 2p⁶ 3s² 3p⁴
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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 an oxygen atom? (2021)
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A.
1s² 2s² 2p⁴
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B.
1s² 2s² 2p²
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C.
1s² 2s² 2p⁶
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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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