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Define ionization enthalpy. What are its units ? What is the principle of its measurement?

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Ionization enthalpy is the amount of energy required to remove an electron from its gaseous atom. It is measured in units of electron volt(eV).
It is measured in an electric discharge tube in which a fast-moving electron generated by an electric current collides with a gaseous atom of the element, which cause it to eject one of its electrons.
Ionization enthalpy is the amount of energy required to remove an electron from its gaseous atom. It is measured in units of electron volt(eV).
It is measured in an electric discharge tube in which a fast-moving electron generated by an electric current collides with a gaseous atom of the element, which cause it to eject one of its electrons.

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