Number of electrons in the outermost shell of chloride ion (Cl-) is:
Correct answer: D. 8
- A. 17
- B. 3
- C. 18
- D. 8
Explanation
A chloride ion (Cl-) is formed when a chlorine atom (Cl) gains one extra electron to achieve a stable electronic configuration. The electronic configuration of a chlorine atom is 1s² 2s² 2p⁶ 3s² 3p⁵. When it gains an extra electron to become a chloride ion, its electronic configuration becomes 1s² 2s² 2p⁶ 3s² 3p⁶. In this configuration, the outermost shell is the third shell (3s² 3p⁶), and it contains 8 electrons, which is the maximum number of electrons a third shell can hold.
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