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First Ionisation Energy

The First Ionisation Energy is the energy needed to remove one electron from each atom of one mole of atoms in their gaseous state to form one mole of gaseous +1 ions.
The equation representing the first ionisation energy of magnesium is:Mg(g) → Mg+(g) + e- Energy is required to remove electrons, so ionisation energies are endothermic. The Second Ionisation Energy is the energy needed to remove one electron from each ion of one mole of gaseous +1 ions to form one mole of gaseous +2 ions. For magnesium:Mg+(g) → Mg2+(g) + e-

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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 1: Atomic Structure and the Periodic Table. Topic: Atomic Structure.

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