what is ionisation energy?
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Ionisation Energy
In physics and chemistry, ionization energy or ionisation energy, denoted Eᵢ, is the minimum amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated neutral gaseous atom or molecule.
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☆The minimum energy required to remove an electron from outermost orbital of atom in its isolated and gaseous state is called as Ionization Energy.
☆ In a group from top to bottom the ionization energy decreases .
☆In a period from left to right the ionization energy increases.
☆Units are kj/mol or kcal/mol or eV
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