Question by : How many valence electrons does a Cl atom have?
The electron configuration for chlorine, Cl is [Ne]3s23p5. How many valence electrons does a Cl atom have?

Write the symbol for the ion it forms to achieve a noble-gas configuration.

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Negative Ions, Beams and Sources: Proceedings of the 1st International Symposium on Negative Ions, Beams and Sources (AIP Conference Proceedings)
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Answer by Otto Balles
Seven, it needs to gain one more to achieve noble gas configuration. So if Chlorine gains another electron it will become negative so the symbol would be Cl with a little negative one (-1) or sometimes when the charge is negative one you can just write the negative sign (-) on the upper right side of it (like a power).
Hope this helps.

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