Which of these have no unit?

Options

(a) Electronegativity
(b) Electron affinity
(c) Ionisation energy
(d) All of these

Correct Answer:

Electronegativity

Explanation:

Electronegativity is unit less quality. Pauling scaleand Mulliken scale are used to determine electronegativity Electron affinityy and ionisation energy are expressed in kJ/mol and eV/atom respectively.