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What will be the sum of principal and azimuthal quantum number for last electron of Argon?

Correct answer

4

Step-by-step solution

Electronic configuration of Ar : 1 s 2 , 2 s 2 2 p 6 , 3 s 2 3 p 6 Therefore, quantum numbers for last electron are n = 3 & l = 1 , so n + l = 4

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