AS chemistry- ionisation energy

HideShow resource information
  • Created by: Heiwa
  • Created on: 14-09-12 19:19

What is ionisation energy?

the amount of energy needed to remove one electron from each atom, in a mole of atoms, in the gas phase. 

There are 3 factors that affect the amount of ionisation energy needed to remove the outer electron. These are...

1) Electron shielding

2)Atomic radii

3)Nuclear charge

Electron shielding

  • electron shielding is where electrons in the inner energy levels 'shield' the positive charge of the nucleus, so other electrons are not as strongly attracted to the nucleus.
  • As the number of energy levels increases the nucleus is shielded more by electrons. So the strong nuclear attraction between the oppositely charged protons and electrons decreases.
  • This means that, as the number


No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Energetics resources »