1. A2
    2. physical properties

    ionisation energy

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    Hannah

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      • electrons are removed from atoms to form ions, energy is required to overcome the electrostatic attraction between the electron and the positive nucleus
      • amount of energy required to remove an electron from an atom is known as the ionisation energy,
    • Definition:
      Ionisation energy is the amount of energy needed to remove a mole of electrons from a mole of atoms, in the gaseous state
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