What is ionisation enthalpy?

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Sunil Gola

The amount of energy required to remove electrons one by one is known as enthalpy of ionisation. The energy required to remove last electron is called first ionization enthalpy, and to remove second last electron is called second ionization energy.
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B.tech m.tech from nit with 20 yrs of teaching experience.

Energy required to convert 1 mole of the atoms of a gas into ion.or simply energy required to strike the electron out of the atom.
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Maths Tutor

The minimum amount of energy required to remove an electron from an isolated gaseous atom is called ionisation/threshold energy.it is also called ionisation potential.
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Chemistry Tutor

Energy required to remove a loosely bound electron from a neutral gaseous atom to make it a gaseous cation
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