Chapter 8 - Section 8.8 - Electron Affinities and Metallic Character - For More Practice - Page 368: 8.9

The correct order of metallic character is: $Cl \lt Si \lt Na \lt Rb$

We know that metallic character decreases when moving right across a row and increases when moving down a column of the periodic table. Hence, the correct order of metallic character is\: $Cl \lt Si \lt Na \lt Rb$