Correct Answer: Option A

Explanation

Electron Count Verification

To determine which ion does not share the same electron configuration, we calculate the number of electrons for each given ion using the formula:
Number of Electrons = Atomic Number - Charge

Option A: Cl\(^-\)

The atomic number of Chlorine (Cl) is 17. 

A -1 charge means it has gained 1 electron.

Total electrons = 17 - (-1) = 18 electrons 

(Configuration: 1s\(^2\)2s\(^2\)2p\(^6\)3s\(^2\)3p\(^6\), matching Argon).

• Total electrons = \(17 - (-1) = \mathbf{18\text{ electrons}}\) (Configuration: \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}\), matching Argon). [1]

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