The electronic configuration of the chloride ion, given that chlorine has atomic number 17, is
Correct answer: B. 1s2 2s2 2p6 3s2 3p6
- A. 1s2 2s2 2p6 3s2 3p5
- B. 1s2 2s2 2p6 3s2 3p6
- C. 1s2 2s2 2p6 3s2 3p4
- D. 1s2 2s2 2p6 3s1
Explanation
Chlorine gains one electron to form the chloride ion, taking its total to 18 and giving it the argon configuration with a complete octet. That stability is exactly why the ion forms so readily. Writing the neutral atom's configuration instead is the standard slip.
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About Electronic Configuration
Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
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