Which of the following have no unit?
(1) Electronegativity
(2) Electron gain enthalpy
(3) Ionisation enthalpy
(4) Metallic character

Answer: 1, 4
Electronegativity is a relative measure of an atom’s ability to attract electrons in a chemical bond. It is expressed on a scale, such as the Pauling scale, which is dimensionless and has no unit. Metallic character refers to the degree to which an element exhibits metallic properties, such as conductivity and malleability. It is also a relative property and does not have a specific unit of measurement.

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