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Structure of the Atom — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
MCQ
The electronic configuration of Cl- ion is:
  • A
    2, 8, 7
  • B
    2, 8, 8
  • C
    2, 8, 6
  • D
    2, 8, 8, 1
✓

Answer

  1. 2, 8, 8

Explanation:

Chlorine atom (Cl) has atomic number 17. It contains 17 protons and 17 electrons.

Chlorine ion (Cl-) is formed when Cl gains one electron.

So, Cl- has 18 electrons and 17 protons.

Therefore, the electronic configuration of Cl- = 2, 8, 8.

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