How does ionisation energy change down a group?

Ionisation energy is the energy required to remove one mole of electrons from gaseous atoms. As you go down the group there are more orbitals so the outer electron which you will remove becomes further from the nucleus so is held less strongly by electrostatic forces of attraction. Therefore it becomes easier to remove the electron so the ionisation energy decreases down a group.  

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Answered by Ammaarah S. Chemistry tutor

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