Lesson: Chapter 10 — Chemical Bonds

10.1. Ionic bonds 3 of 10 Reset answers

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Question 3

A chlorine atom has the configuration 2, 8, 7. What is the electron configuration of the chloride ion, Cl⁻?

A 2, 8, 8 B 2, 8 C 2, 8, 6 D 2, 8, 7

The right answer is the one marked above.

2, 8, 8. The ion forms by accepting one electron into the outer shell, completing it at eight.

2, 8, 7 is the atom before it gains anything. 2, 8, 6 would mean an electron was lost rather than gained, and 2, 8 is the configuration of the sodium ion, not the chloride ion.

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