Ionisation Energy

Ionisation Energy

1. Definition

   • The energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions

2. Factors affecting ionisation energy

   • Atomic radius
     • The more shells, the further the outer electrons are from the nucleus, the less attraction
   • Nuclear charge
     • The more protons, the greater the nuclear charge, the greater the attraction
   • Electron shielding
     • Inner shells repel outer shells. The more inner shells, the greater the shielding effect

3. Successive I.E

   • Energy required to remove one more electron from the ion
   • Each successive IE is greater than the last
   • Plotting successive IE
     • Evidence
       • Number of shells
       • Number of electrons in each shell