Which of the following have no unit?

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Electronegativity

Electron gain enthalpy

Ionisation enthalpy

Metallic character

answer is A, D.

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Detailed Solution

The propensity of an atom to draw the shared electron pair toward itself is known as [A] electronegativity. It lacks units.
[B] Electron gain enthalpy: This term is also used to refer to electron affinity. The amount of energy released when an electron is added to a neutral gaseous atom is measured by this term. In kJ/ mole, it is measured. Ionization enthalpy (C): The minimal amount of energy needed to eliminate the outermost electron. It measures in kJ/mole.
(D) Metallic nature: Metallic nature is more prevalent in elements with strong electro positive. It is not a unit.
Option A and D is correct.

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