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

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Metallic character and electronegativity both don't have any unit. Electronegativity is defined on Pauling scale with Max value of 4 for fluorine
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Metallic character and electronegativity
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Electronegativity and metalic character
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