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Atomic Size and Electronegativity

Which of the ...

Question

Which of the following have no unit?
(a) Electronegativity (b) Electron gain enthalpy
(c) Ionlsation enthalpy (d) Metallic character

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Solution

Electronegativity and metallic character have no units while electron gain enthalpy and ionlsation enthalpy have units of $k J m o l^{- 1}$

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