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Outer electronic configuration of Cl⁻ is:

1. 3s²3p³3p²3p¹
2. 3s²3p³3p²3p²
3. 3s²3p³3p³3p¹
4. 3s²3p³3p³3p²

Correct answer: 3s²3p³3p³3p²

Solution

The chloride ion (Cl⁻) has gained one electron compared to a neutral chlorine atom, resulting in a configuration of 3s²3p⁶, which corresponds to option D.

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