BRAINCAKEFirst 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, under standard conditions.
The equation representing the first ionisation energy of magnesium is:
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Key terms in this lesson
- Mole
- The amount of substance that contains as many particles as there are atoms in exactly 12g of carbon-12.
- Endothermic
- Describes a reaction in which energy is transferred from the surroundings to the system, so the enthalpy change is positive.
- Standard conditions
- A pressure of 100 kPa, a temperature of 298 K, and, for solutions, a concentration of 1 moldm-3.
More in Atomic Structure
- Quantum Mechanics
- Energy Levels
- Atomic Orbitals
- Order of filling orbitals
- Electron Configuration
- Successive Ionisation Energies
- Trends in First Ionisation Energy Across a Period
- Trends in Ionisation Energy Down A Group
All 22 lessons in Atomic Structure · All AQA AS-level Chemistry topics