From the statements below, identify which one(s) is/are incorrect:
(i) Electronegativity is measured in kJ/mol units.
(ii) Electron affinity is different from electronegativity.
(iii) Electronegativity is the tendency to attract shared electrons when forming a chemical bond.
(iv) The most electronegative element in the periodic table is helium.
(v) The least electronegative element in the periodic table is radon.
