Which of the following atoms achieves a stable octet by gaining one electron?
Chlorine (Cl) has 7 valence electrons ( [Ne] 3s² 3p⁵ ). Gaining one electron forms Cl⁻ with a noble gas configuration ( [Ar] ).
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Hydrogen Bonding and Resonance and Dipole Moment
