Cs is BEST oxidising agent DUE to lowest I.E. `Li^(+)` is best REDUCING agent due to highest `|Delta_(hyd)H^(Theta)|` `Li^(+)` is best reducing agent due to highest `Delta_(hyd)H^(Theta)` `Cs^(+)` is best oxidising agent due to low `|Delta_(hyd)H^(Theta)|`