Ionisation energy 0.0 / 5 ? ChemistryAtomic StructureASAQA Created by: 5hyl33nCreated on: 30-08-20 00:00 Ionisation energy The energy required to remove a mole of electrons from a mole of atoms in the gaseous state and is measured in kJ mol^-1 1 of 5 First ionisation energy Na (g) -> Na^+ (g) + e^- 2 of 5 Second ionisation energy Na^+ (g) -> Na^2+ (g) + e^- 3 of 5 Third ionisation energy Na2^+ (g) -> Na^3+ (g) + e^- 4 of 5 Increase or decrease? Ionisation energies increase as more energy is needed to remove an electron. 5 of 5
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