Which element in the fifth period has the highest electronegativity among p-block elements?
In period 5 p-block (Rb to Xe), electronegativity increases across. I (group 17) has the highest electronegativity among Sn, Sb, and I, excluding noble gases.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency