A. 1s electron of helium
B. 1s electron of potassium
C. 23 electron of boron
D. 2s electron of carbon
Correct Answer: Option A
A. 1s electron of helium
A. 1s electron of helium
B. 1s electron of potassium
C. 23 electron of boron
D. 2s electron of carbon
Correct Answer: Option A
A. 1s electron of helium
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