Which ion achieves a noble gas configuration by losing one electron and belongs to Group 1?
Sodium (Na) in Group 1 has [Ne] 3s¹ . Losing 1 electron forms Na⁺ with [Ne] , a noble gas configuration.
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: VSEPR Theory and Shapes of Molecules