Valence electrons are the electrons in the outermost principal energy level (shell) of an atom or ion. Anions like Cl⁻ are formed by gaining electrons, which occupy the available spaces in the valence shell or the next available shell.
Number of valence electrons in Cl⁻ ion are
Asked in WBCS Main Paper 4 2021 · Topic: Atomic Structure (Electronic Configurations of Multi-electron Atoms and Ions)
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