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First Ionisation Energy

The first ionisation energy is the enthalpy change accompanying the removal of one electron from each atom in one mole of gaseous atoms to form one mole of gaseous +1 ions under standard conditions. For exampleNa(g) → Na⁺(g) + e^-Ionisation energy is always endothermic.

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Specification: Edexcel Chemistry (9CH0), A-level, Topic 13A: Lattice energy. Topic: Lattice Enthalpy.

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