Plumbum

Hi everyone I have difficulties with the binding energy and I hope that somebody can help me out! The task is to order these atoms by their binding energy ( from lowest zo highest) The atoms are C, Si, Ge, Pb, Sn and I should explain why. So I ordered them this way : Pb,Sn,Ge,Si,C due to electronegativitiy. I'm really not sure , if its correct this way , please help me out. thank u !