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How many electrons does chlorine need to become stable?

Quick Answer

Chlorine needs 1 more electron to fill its outer shell. That is why it often forms the chloride ion, Cl−.

The Full Story

Chlorine has 7 electrons in its outer shell, so it is one electron short of a full octet. It often gains one electron to become chloride, Cl−, which gives it a stable configuration like argon. This strong tendency to gain an electron makes chlorine very reactive and explains why it readily forms salts with metals. Chlorine is a halogen in Group 17, a family known for high reactivity. Its compounds are important in disinfectants, plastics, and many industrial chemicals.

Key Facts

1.Chlorine needs 1 electron
2.Forms Cl−
3.Chlorine is in Group 17

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Suggested video title for this topic:

"One missing electron makes chlorine a chemical powerhouse"

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