BRAINCAKEIonisation 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.
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Key terms in this lesson
- Ion
- A positively or negatively charged atom or group of atoms, formed by the loss or gain of electrons.
- Ionisation
- The loss or gain of electrons by an atom or molecule to form a charged ion.
- Mole
- The amount of substance that contains as many particles as there are atoms in exactly 12g of carbon-12.
- Endothermic
- Describes a process in which heat 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 Atoms, Ions and Compounds
- Calculating Relative Atomic Mass
- Chemical Formulae
- Polyatomic ions
- Chemical Equations
- Electron Shells
- Spin
- Successive Ionisation Energies
- Trends in Ionisation Energy
All 17 lessons in Atoms, Ions and Compounds · All OCR AS-level Chemistry topics